JP5143231B2 - Copolymer stabilized emulsion - Google Patents

Description

  The present invention relates to droplet structures, emulsions of droplet structures, and methods of making droplet structures and emulsions, and more particularly, droplet structures stabilized with block copolymers, emulsions of droplet structures, and The present invention relates to a droplet structure and a method for producing an emulsion.

(Cross-reference of related applications)
This application claims priority to US application 60 / 935,605, provisional application filed August 21, 2007, which is hereby incorporated by reference in its entirety.

  The present invention was obtained using US Government Grant CHE-0415275 awarded by the National Science Foundation, which has certain rights in this application.

  A simple emulsion (emulsion) is a dispersion of one liquid droplet in another immiscible liquid, which is generally against coalescence by a surfactant that provides shearing and repulsion at the interface. Formed by stabilization (J. Bibette, F. Leal-Calderon, and P. Poulin, Rep. Prog. Phys. 62, 1999, p. 969). (All of the references herein are hereby incorporated by reference.) The two most common are "direct" oil-in-water (oil / water) emulsions and vice versa. And water-in-oil (water / oil) emulsions. Surfactants are amphiphilic molecules that can take a variety of different forms, such as ions (eg, anions, cations, zwitterions), non-ions (eg, ethoxylated alkane chains), polymers (eg, Simple polymer, diblock polymer, and triblock polymer). Since they are amphiphilic, surfactants tend to preferentially adsorb at the oil-water interface. The relative solubility of the surfactant in oil and water, the concentration of the surfactant, and the degree of repulsive force at the interface that the surfactant provides when the surfactant is adsorbed to the interface is smaller from the larger droplet structure It is an important factor in determining the stabilization and lifetime of emulsions formed by the application of shear flow or other non-thermal external stress sources that cause breakage into the droplet structure.

  In addition to simple emulsions, there are high topological complexity levels. For example, a water / oil emulsion can be sheared into an aqueous continuous liquid to create a dispersion of oil droplets that themselves contain smaller water droplets. By judicious selection of the surfactant, both the “inside” water droplets within the oil droplets and the larger oil droplets themselves can remain stable over time. This type of emulsion is called a water-in-oil-in-water (water / oil / water) emulsion. Emulsion systems with this level of topological complexity are commonly referred to as “double emulsions”. This is because starting from a continuous liquid phase and reaching the center of the smallest droplet structure must penetrate two oil-water interface layers. In fact, it is possible to produce triple emulsions and topologically higher order emulsions through a series of controlled emulsification processes, which reach the center of the smallest droplet structure of the system. It contains a number of interfacial layers that must penetrate. A water / oil / water double emulsion has outer oil droplets, each containing only one inner water droplet. However, the water / oil / water double emulsion oil droplets can also have a large number of inner water droplets. Sometimes this is mistakenly called "multiple emulsion". Rather, more precisely, it should be referred to as a water / oil / water double emulsion with outer oil droplets each typically containing a plurality of inner water droplets. Two average volume fractions of the droplets can be used to roughly characterize the double emulsion, which is the average of the “inner volume fraction” of the water droplets in the oil droplets and in the continuous aqueous solution. There is an average of the “outer volume fraction” of the water / oil droplets. In general, there is a total distribution of radii corresponding to inner water drops and a different distribution of radii corresponding to outer water drops. It is desirable that these distributions exhibit a fairly sharp unimodal peak so that the droplet size is highly controlled, or “uniform”. Another structural form that characterizes the double emulsion is a probability distribution of the number of inner drops for one outer drop. The main focus here is on the production of water / oil / water double emulsions (ie aqueous double droplets), but oil-in-water-in-oil (oil / water / oil) doubles without an aqueous continuous phase. It is equally possible to make an emulsion. For oil-in-water single emulsions and oil-in-water-in-oil double emulsions, φ is generally used to specify the oil volume fraction, and φ is the volume of oil contained in the emulsion system as the total volume of the emulsion system. Divided.

  In recent years, highly uniform water / oil / water double emulsions have been provided by two main routes: structured microfluidics and sequential emulsification, with the average diameter of the outer droplets exceeding 1 micrometer. It is. The first path is through a relatively low throughput microfluidic method. In one implementation of this path, a first cross-channel flow junction is used to generate water droplets in the oil, followed by a second cross-coupled fluid path using water / oil. The droplets are broken up into a continuous aqueous phase to produce a water / oil / water emulsion (S. Okushima et al., Langmuir 20, 2004, p. 9905). Alternatively, highly uniform water / oil emulsions can be made with higher throughput using porous glass emulsification and membrane emulsification rather than micromachined fluid paths. This implementation allows for very robust inclusion of a large number of inner droplets within a double emulsion. In the second implementation method of microfluidic crushing, the innermost water jet, the middle oil jet, and the outermost water jet flow simultaneously generate capillary instabilities at the inner and outer interfaces using microfluidic channels. (AS Utada et al., Science 308, 2005, p.537). This method is suitable for encapsulating an object in the innermost water-soluble jet into a water / oil / water double emulsion containing one inner droplet. However, it is extremely difficult to adjust this flow so that a double emulsion containing a specific number of inner droplets is formed with the desired volume fraction. In both microfluidic methods, an appropriate surfactant must be present in the liquid phase to maintain the stability of the emulsion after formation.

  The second path is sequential emulsification, which is a conventional format, without the use of micromachined channels. In sequential emulsification, a water / oil emulsion is first produced, followed by sequential emulsification of this simple inverse emulsion into an aqueous surfactant solution using shear (W. Yafei, Z. Tao, and H. Gang, Langmuir). 22, 2006, p.67). If desired, both water and oil droplets of this water / oil / water double emulsion can be fractionated by particle size to make them monodisperse. Without fractionation, the conventional methods are very high throughput and can produce several liters per unit time. If a high level of monodispersity is desired, processing is slowed down by fractionation. A variation of this method is a high throughput method (C. Goubault et al., Langmuir 17, 2001, p. 5184) that produces quasi-monodisperse oil droplets by shearing through pre-mixed double emulsions in narrow gaps. Use previously developed methods to produce monodisperse simple emulsions (TG Mason and J. Bibette, Phys. Rev. Lett. 77, 1996, p.3481, TG Mason and J. Bibette Langmuir 13, 1997, p.4600). As with double emulsions produced using the microfluidic method, the choice of surfactant in the sequential emulsification method is also important to obtain the desired stability and release characteristics.

  Like small molecule surfactants and lipids, synthetic block copolymers can self-assemble into ordered nanostructures via microphase separation of macromolecular components (AJ Link ML Mock and DA Tirrell, Curr Opin Biotech 14, 2003, p. 603). However, the ability of block copolymers to organize into hierarchically structured materials or well-defined tertiary structures, as found in biological systems (eg, proteins), is random coiled in most common polymers. Limited by the nature of and the limited function of the polymer region. Hydrogen bonding (GA Silva et al., Science 3032004, p.1352), amphiphilicity (DE Discher and A. Eisenberg, Science 297, 2002, p.967), crystallization (GD Fasman, Prediction of protein structure and The principles of protein conformation (Plenum Press, New York), 1989, pp.xiii), and incorporation of elements that promote liquid crystal formation (DJ Pochan et al., Macromolecules 35, 2002, p.5358) are all structural evolution It works to influence (J. Rodriguez-Hernandez and S. Lecommandoux, J Am Chem Soc 127, 2005, p. 2026). Increasing the complexity of copolymer sequences (double to triple block, triple to quadruple block, etc.) also enhances the potential of hierarchical organization (IW Hamley, Soft Matter 1, 2005, p. 36). ). A major limitation in using these strategies is that the synthetic chemistry required to produce functional and multi-component block copolymers is a major obstacle because of incompatibility with different monomer polymerization methods. (AJ Link, ML Mock, and DA Tirrell, Curr Opin Biotech 14, 2003, p. 603). In addition, since the most common synthetic polymers lack the complex complexity found in biopolymers (eg, secondary structure, complex functionality, and stereochemistry), they are self-organized biopolymers. You can never imitate your behavior. For these reasons, self-assembly of block copolypeptides as synthetic materials with the ability to aggregate into specifically identified functional nanostructures, including vesicles and hydrogels, prior to investigation of emulsion systems Studied. These non-emulsion substances are generally formed through interactions between copolypeptides and have a bottom-up self-assembly. However, the use of synthetic constituents (eg, non-amino acid monomers) in the formation of synthetic copolymer blocks, and the use of higher order triple block and multiblock polymer structures is a general concept of the present invention. Is not excluded.

As a preliminary study of the invention described herein, the role of chain length and block organization in the organization of small charged diblock copolypeptide amphiphiles was studied, including a rod-like α-helix in the hydrophobic region. The chemical structure leading to the properties of the fragments was utilized. Specifically, a series of poly (L-lysine) -b-poly (L-leucine) block copolypeptides K _x L _y (x = 20 Residues ranging from to 80, y ranging from 10 to 30), and poly (L-glutamine) -b-poly (L-leucine) (poly (L-glutamatic) -b-poly (L-leucine)) Hydrous self-assembly of the block copolypeptide E ₆₀ L ₂₀ (EP Holowka, DJ Pochan, and TJ Deming, J Am Chem Soc 127, 2005, p. 12423) was generated and studied. Fragments of poly (L- lysine · Hbr) (poly (L- lysine · Hbr)) and poly (L- glutamine ^{-Na +) (poly (L-} glutamate-Na +)) is highly charged at neutral pH The polymer electrolyte is easily dissolved in water. In initial studies, it was found that samples with a high K to L molar ratio (eg, K ₁₈₀ L ₂₀ ) can be dissolved directly in deionized water, resulting in a transparent hydrogel consisting of twisted fibrils (AP Nowak et al. , Nature 417, 2002, p.424). This reasoned that the use of shortened charged fragments attenuated the repulsion of polyelectrolyte interactions and allowed the formation of charged polypeptide membranes. In the first series of copolymers, the size of the oligoleucine region was constant at 20 residues and the oligolysine region was varied from 20 to 80 residues. The sample was subjected to dialysis treatment by suspending the dry polymer in THF / water (1: 1). Analysis of these textures by differential interference contrast (DIC) optical microscopy revealed the presence of a large sheet of K ₂₀ L ₂₀ and thin fibrils of K ₄₀ L ₂₀ . The K ₆₀ L ₂₀ sample was most promising, as only large vesicle-like organization was observed by DIC optical microscopy (EP Holowka, DJ Pochan, and TJ Deming, J Am Chem Soc 127, 2005, p. 12423).

The vesicles of K ₆₀ L ₂₀ polypeptide obtained directly from dialysis are polydisperse and their diameters ranged from about 5 μm to 0.8 μm using DIC and dynamic light scattering (DLS). (FIG. 1). For applications such as drug delivery via blood circulation, the vesicle diameter is desirably about 50 nm to 100 nm, and more preferably 200 nm. It has been found that an aqueous suspension of K ₆₀ L ₂₀ vesicles can be extruded through a nuclear track etched polycarbonate (PC) membrane with little loss of polypeptide material. After two passes through the filter, a decrease in vesicle diameter was observed to a value approximately consistent with the filter pore size. These results indicate that charged polypeptide vesicles are easily extruded and allow good control of vesicle diameter over a range of 10 nm to 100 nm (FIG. 1). Particle size analysis by DLS revealed that the extruded vesicles were not as polydispersed as before extrusion and did not contain micellar impurities. Vesicle morphology was also confirmed by transmission electron microscopy (TEM) images of K ₆₀ L ₂₀ submicron suspensions. Extruded vesicles were monitored for 6 weeks using DLS and were found to be stable because the mean diameter did not change in most samples. It was also observed that vesicles have high thermal stability. No vesicle fragmentation was detected after holding a 1 μm vesicle suspension in water at 80 ° C. for 30 minutes (EP Holowka, DJ Pochan, and TJ Deming, J Am Chem Soc 127, 2005, p. 12423). . Only when heated at 100 ° C. for 30 minutes, the vesicles split and became a large flat film-like sheet.

The stability of these highly charged polypeptide vesicles in the ionic medium is important for use in most applications ranging from personal care products to drug delivery. K ₆₀ L ₂₀ vesicles are unstable and aggregate at high salt concentrations (> 0.5 M), but are stable in 100 mM PBS buffer and in serum-free DMEM cell culture medium (EP Holowka, DJ Pochan and TJ Deming, J Am Chem Soc 127, 2005, p. 12423). Addition of serum containing anionic protein leads to vesicle division, probably due to the formation of a polyion complex between the serum protein and the reversely charged polylysine chain. Thus, negatively charged polypeptide vesicles made with E ₆₀ L ₂₀ were found to be stable in DMEM with 10% fetal calf serum. Based on these results, it is considered that these charged polypeptide vesicles show potential as encapsulants for water-soluble solutes that can substitute for liposomes. Another feature of these charged polypeptide vesicles is the simplified functionalization of hydrophilic polypeptide chains on the surface of vesicles through chemical conjugation with amine or carboxylic acid residues, or careful selection of charged residues. It is potential. For example, there is the generation of vesicles of arginine leucine (ie, R ₆₀ L ₂₀ ) that can be easily entered into cells by a number of recently announced guanidine groups of arginine fragments (EP Holowka et al., Nat Mater 6, 2007, p.52). In this case, arginine residues play two roles: structure orientation in vesicle formation, and cell binding and cell entry functions. A key property of a block copolypeptide that favors the design of biomimetic membranes with multifunctional properties is the ability to place structurally functional atoms at precise positions within the polymer chain. In the embodiment of the present invention, the copolypeptide present at the interface of the droplet can also take advantage of such multi-functional properties, including the form and topology of the droplet structure and the structure of the droplet as cells or Control over how to interact with other target materials is included.

  Due to these compartmented internal structures, water / oil / water double emulsions have advantages over simple oil-in-water (oil / water) emulsions in encapsulation, which are polar cargos (inner droplets) Water-soluble molecules or water-dispersible colloids) and nonpolar cargos (such as oil-soluble molecules or oil-dispersible colloids in the outer oil droplets), the ability to carry both simultaneously, oil-soluble and water-soluble drug molecules With the ability to deliver to a very specific local area (eg, via a target portion of the molecule that modifies the inner and outer surfaces of the droplet) in combination therapy, as well as improved control of the temporary release of the therapeutic molecule (K. Pays et al., Double emulsions: how does release occur ?. Journal of Controlled Release 79, 2002, p.193-205, SS Davis, and IM Walker, Multiple Emulsions as Targetable Delivery. Systems.Methods in Enzymology 149, 1987, p.51-64, H. Okochi, and M. Nakano, Preparation and evaluation of W / O / W type emulsions containing vancomycin.Advanced Drug Delivery Reviews 45, 2000, p. 5-26). The formation of double emulsions generally requires a mixture of surfactants to stabilize and the formation of double nanoemulsions where both the inner and outer droplets are 100 nm or less is achieved so far. (N. Garti, Double emulsions-Scope, limitations and new achievements. Colloids and Surfaces A-Physicochemical and Engineering Aspects 123, 1997, p.233-246, IG Loscertales et al., Micro / nano encapsulation via electrified coaxial liquid jets. Science 295, 2002, p.1695-1698, AS Utada et al., Monodisperse double emulsions generated from a microcapillary device. Science 308, 2005, p.537-541).

  Although there are advantages over conventional oil / water emulsions, stable water / oil / water emulsions are generally not formed spontaneously using one surfactant with standard methods and standard emulsification methods. (N. Garti, Double emulsions-Scope, limitations and new achievements. Colloids and Surfaces A-Physicochemical and Engineering Aspects 123, 1997, p.233-246, JM Morais, ODH Santos, JRL Nunes, CF Zanatta, and PA Rocha -Filho, W / O / W Multiple emulsions obtained by one-step emulsification method and evaluation of the involved variables, Journal of Dispersion Science and Technology 29, 2008, p.63-69). Although microfluidics can be used to produce micro-sized, highly uniform double emulsions (IG Loscertales et al., Micro / nano encapsulation via electrified coaxial liquid jets. Science 295, 2002, p.1695-1698, AS Utada et al., Monodisperse double emulsions generated from a microcapillary device (Science 308, 2005, p.537-541), processing capacity is low compared to commercial methods for producing polydisperse single emulsions (TG Mason, JN Wilking, K. Meleson, CB Chang, and SM Graves, Nanoemulsions: formation, structure, and physical properties. Journal of Physics-Condensed Matter 18, 2006, p.R635-R666). A typical method for producing a water / oil / water emulsion is to first form a “reverse” water-in-oil (water / oil) emulsion, followed by emulsification of this mixture in water using a combination of surfactants. (MF Ficheux, L. Bonakdar, F. Leal-Calderon, and J. Bibette, Some stability criteria for double emulsions. Langmuir 14, 1998, p.2702-2706, YF Wang, Z. Tao and H. Gang, Structural evolution of polymer-stabilized double emulsions.Langmuir 22, 2006, p.67-73, N. Garti, Double emulsions-Scope, limitations and new achievements.Colloids and Surfaces A-Physicochemical and Engineering Aspects 123, 1997, p.233-246, C. Goubault et al., Shear rupturing of complex fluids: Application to the preparation of quasi-monodisperse water-in-oil-in-water double emulsions.Langmuir 17, 2001, p. .5184-5188, S. Okushima, Nisisako, T. Torii, and T. Higuchi, Controlled production of monodisper se double emulsions by two-step droplet breakup in microfluidic devices.Langmuir 20, 2004, p.9905-9908). This treatment method can control the volume of both the inner and outer droplets if the emulsion in both steps is monodisperse, but this method is stable nanoscale droplets (ie, inner droplets). The diameter of both droplets and outer droplets is nanoscale). Furthermore, this method has made it difficult to find a combination of surfactants that can coexist without destabilizing both the inner and outer droplets (MF Ficheux, L. Bonakdar, F. Leal-Calderon and J. Bibette, Some stability criteria for double emulsions. Langmuir 14, 1998, p.2702-2706). Thus, there is a need for improved stability against droplet size progression (eg, through coalescence and / or coarsening) and reduction of droplet size in producing double emulsions for application (A. Benichou A. Aserin, and N. Garti, Double emulsions stabilized with hybrids of natural polymers for entrapment and slow release of active matters. Advances in Colloid and Interface Science 108-109, 2004, p.29-41).

  The emulsion in an embodiment of the present invention includes a substantially continuous liquid medium and a plurality of droplet structures dispersed within the substantially continuous liquid medium. Each of the plurality of droplet structures in the embodiment of the present invention includes an outer droplet of the first liquid having an outer surface and an inner droplet of the second liquid in the first droplet. The second liquid is immiscible with the first liquid, and the inner droplet and the outer droplet are an inner droplet having a boundary surface region therebetween, and a block disposed on the outer surface of the outer droplet. An outer layer of the copolymer and an inner layer of the block copolymer disposed in a boundary surface region between the outer droplet and the inner droplet. The block copolymer comprises a hydrophilic polymer block and a hydrophobic polymer block, which together act to stabilize the droplet structure and the first liquid is immiscible in a substantially continuous liquid medium. It is sex.

  The emulsion in the embodiment of the present invention includes a liquid medium and a plurality of nanodroplets dispersed in the liquid medium. Each of the plurality of nanodroplet droplet structures includes an inner droplet of the first liquid surrounded by the second liquid, the first liquid being immiscible with the second liquid, Is immiscible in the liquid medium. The ensemble average diameter of the plurality of nanodroplets is at least about 10 nm and not more than about 200 nm.

  The emulsion in an embodiment of the present invention includes a substantially continuous liquid medium and a plurality of droplet structures dispersed within the substantially continuous liquid medium. Each droplet structure of the plurality of droplet structures includes a liquid droplet having an external surface and a block copolymer layer disposed on the external surface. The block copolymer includes a hydrophilic polymer block and a hydrophobic polymer block, which together act to stabilize the droplet structure, and the liquid of the plurality of droplet structures is a substantially continuous liquid medium Is immiscible.

  The method for producing an emulsion in an embodiment of the present invention is a step of preparing a first liquid and a second liquid, wherein the first liquid is immiscible with the second liquid; Adding a selected amount of the block copolymer to at least one of the second liquid and the second liquid, and generating a plurality of droplets of the first liquid dispersed in the second liquid. Emulsifying the liquid in the second liquid. The block copolymer is stabilized so that the plurality of droplets do not coalesce.

  The method for producing an emulsion according to an embodiment of the present invention includes adding a surfactant to at least one of the first liquid and the second liquid, or at least one of the first liquid and the second liquid. Adding at least one step of adding a surfactant precursor and second liquid to form a simple emulsion to form a plurality of droplets of the first liquid immersed in the second liquid; At least one of the same surfactant and the same surfactant precursor as the third liquid, and the step of emulsifying in the liquid of the first liquid, wherein the first liquid is immiscible with the second liquid And emulsifying the simple emulsion into the third liquid so as to form a plurality of droplets of the simple emulsion resulting in a double emulsion, wherein the second liquid is immiscible with the third liquid. Steps that are sex , Including the. Each of the plurality of droplets of the double emulsion includes at least one droplet of the first liquid therein.

  Hereinafter, various embodiments which are further features of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, the above and other advantages of the present invention will be better understood with reference to the following detailed description and accompanying drawings.

FIG. 1A and FIG. 1B are optical microscope images (horizontal bars) using differential interference contrast of a 1% (w / v) suspension of polypeptide vesicles extruded through a 1.0 μm polycarbonate (PC) membrane. = 5 μm). FIG. 1A shows K ₆₀ L ₂₀ and FIG. 1B shows E ₆₀ L ₂₀ . FIG. 1C shows a transmission electron microscope (TEM) image (lateral) of a 0.1% (w / v) K ₆₀ L ₂₀ vesicle suspension negatively stained with uranyl acetate through a filter of 0.1 μm PC membrane. Bar = 350 nm). FIG. 1D shows the average diameter of a 1% (w / v) aqueous suspension of K ₆₀ L ₂₀ (black circles) and E ₆₀ L ₂₀ (white rectangles) as a function of PC membrane pore size. Vesicle size was measured using dynamic light scattering (DLS).

2A and 2B are equivalent diagrams of the block copolypeptides K _x rL _y and K _x L _y used for emulsification, respectively. FIG. 2C shows an overview of an emulsification process using a K _x rL _y block copolypeptide in some embodiments of the present invention to produce a water-in-oil-in-water double emulsion. FIG. 2D shows an overview of an emulsification process for producing an oil-in-water droplet single emulsion using a K _x L _y block copolypeptide in some embodiments of the present invention. In FIG. 2C and FIG. 2D, step (i) shows a normal emulsification that can produce microscale droplets using a rotary mixer, and step (ii) uses a microfluidic homogenizer to produce nanoscale liquids. Shows more extreme emulsification where drops can be produced. A detailed portion of the generated droplet interface, ie, a summary of the copolypeptides at the interface of the double and direct emulsion droplets, is shown on the right side of FIGS. 2C and 2D, respectively.

FIGS. 3A-3D show cryogenic transmission electron microscopes of K _x rL _y block copolypeptide double emulsions generated using a microfluidic homogenizer (Microfluidics Microfluidizer (r) 11OS with 75 μm channel volume interaction chamber) ( Cryo-TEM) images and dynamic light scattering (DLS) data. All emulsions were produced under the following conditions (number of microfluidic homogenizer passes N = 6, input air pressure p = 130 psi to microfluidic homogenizer, copolypeptide concentration in water C = 1 mM, total oil volume fraction φ = 0. .20). The oil is a polydimethylsiloxane (PDMS) silicone oil having a viscosity of 10 cSt. Droplet radius is measured using cumulant analysis from DLS data. FIG. 3A = K ₄₀ rL ₅ , FIG. 3B = K ₄₀ rL ₁₀ , FIG. 3C = K ₄₀ rL ₂₀ , and FIG. 3D = K ₄₀ rL _{30 in} a Cryo-TEM image (horizontal bar = 100 nm) of the K _x rL _y emulsion. . FIG. 3E shows the effective droplet radius (near the outer droplet radius) of the double emulsion as measured by DLS (nm) as a function of the length of the K and rL blocks of the copolypeptide. FIG. 3F is a histogram (ie, probability distribution) of the ratio of K ₄₀ rL ₁₀ inner droplet radius to outer droplet radius measured from Cryo-TEM images. FIG. 3G shows the average droplet radius <a> (nm) for K ₄₀ rL ₁₀ as a function of block copolymer concentration C (mM). Figure 3H is the average droplet radius <a> measured by DLS (nm) of securing the block length of K ₄₀ Racemic - shown as a block length function of leucine (rL).

4A to 4D are images showing details of a method for adjusting the particle size of water / oil / water double emulsion droplets. FIG. 4A shows a laser confocal scanning microscope (LCSM) of a 0.1 mM FITC labeled K ₄₀ rL ₁₀ emulsion (total oil volume fraction φ = 0.20, ₁₀ cSt PDMS silicone oil) produced using an ultrasonic homogenizer. ) Image (horizontal bar = 5 μm). FIGS. 4B-4D are emulsions produced using a microfluidic homogenizer (75 μm interaction chamber). FIG. 4B is a Cryo-TEM image (horizontal bar = 100 nm) of a K ₄₀ rL ₁₀ emulsion with N = 6, p = 130 psi, C = 1 mM, and φ = 0.20. FIG. 4C is a Cryo-TEM image (horizontal bar = 100 nm) of a K ₄₀ rL ₂₀ emulsion with N = 6, p = 130 psi, C = 1.5 mM, and φ = 0.20. FIG. 4D shows a smaller double nanoemulsion of the residual suspension obtained by ultra-high speed centrifugation of K ₄₀ rL ₂₀ emulsion with N = 6, p = 130 psi, C = 1.5 mM, and φ = 0.20. Cryo-TEM image (horizontal bar = 100 nm). FIG. 4E shows the average solution of K ₄₀ rL ₂₀ emulsion (N = 6, p = 130 psi, C = 0.1 to 1.5 mM, and φ = 0.20) measured by DLS as a function of block copolymer concentration. The drop radius <a> is indicated. FIG. 4F shows the average droplet radius <a> of K ₄₀ rL _y (N = 6, p = 130 psi, C = 1 mM, and φ = 0.20) measured by DLS, as a block of racemic-leucine (rL). Shown as a function of length y.

FIG. 5A is an LCSM image (10 sec, horizontal bar = 5 μm) of 0.1 mM FITC-labeled K ₄₀ rL ₁₀ double emulsion (φ = 0.20, ₁₀ cSt PDMS silicone oil) generated using an ultrasonic homogenizer. It is. FITC-labeled copolypeptides emit green fluorescence. FIG. 5B shows a multicolor fluorescence microscope overlay image (horizontal bar = 5 μm) of C = 0.1 mM FITC-labeled K ₄₀ rL ₁₀ double emulsion generated using an ultrasonic homogenizer (10 seconds) with ₁₀ cSt silicone oil (horizontal bar = 5 μm). Indicated by 0.01 M pyrene (blue fluorescence) in the outer droplet of φ = 0.20) and nanoscale InGaP / ZnS quantum dots (fluorescence red) in the inner aqueous droplet.

FIGS. 6A-6B are LCSM images of 0.1 mM FITC-labeled copolypeptide double emulsion (φ = 0.20, 10 cSt PDMS silicone oil) produced using an ultrasonic homogenizer (10 seconds). 6A shows K ₆₀ L ₂₀ and FIG. 6B shows K ₄₀ rL ₁₀ . FIG. 6C shows a Cryo-TEM image of a 1.0 mM E ₄₀ rL ₁₀ emulsion (N = 6, p = 130 psi, C = 1 mM, and φ = 0.20) generated using a microfluidic homogenizer (horizontal bar = 250 nm). FIG. 6D shows a Cryo-TEM image (horizontal bars = 1.0 mM K ₄₀ rL ₁₀ emulsion (N = 6, p = 130 psi, C = 1 mM, and φ = 0.20) produced using a microfluidic homogenizer. 250 nm). FIG. 6E shows oil and water-soluble K ₆₀ homopolymer after attempting to produce emulsions and / or double emulsions using similar external excitation with similar polypeptide concentration and total oil volume fraction as in the other images. It is a photograph of phase separation of silicone oil and water due to non-emulsification of a polypeptide.

FIGS. 7A to 7C are Cryo-TEM images (horizontal bars = 200 nm) of K _x (rac-L) _y stabilized double emulsion produced using a microfluidic homogenizer under the following conditions (number of passes N). = 6, microfluidic homogenizer input air pressure p = 130 psi, block copolypeptide concentration C = 1.0 mM, and total oil volume fraction φ = 0.20 (10 cSt PDMS silicone oil)). 7A shows K ₄₀ (rac-L) ₅ , FIG. 7B shows K ₄₀ (rac-L) ₁₀ , and FIG. 7C shows K ₄₀ (rac-L) ₃₀ . FIG. 7D shows the observed probability distribution (%) of the inner radius a _i and the outer radius a _o of at least 50 double emulsion droplets observed in the Cryo-TEM image of the K ₄₀ (rac-L) ₁₀ emulsion. FIG. 6 is a histogram shown as a function of the ratio of a _i to a _o determined by measurement (I / O ratio). FIG.

8A-8D are Cryo-TEM (CTEM) images of various block copolypeptides used to stabilize double emulsions. Microfluidic homogenizer with the following conditions: N = 6, input air pressure p = 130 psi to microfluidic homogenizer, block copolypeptide concentration C = 1.0 mM, and oil volume fraction φ = 0.20 (10 cSt PDMS silicone oil). R ₄₀ (rac-L) ₁₀ (R = L-arginine hydrobromide is used for polymerization, FIG. 8A) and E ₄₀ (rac-L) ₁₀ (E = L-glutamic acid sodium salt is polymerized) CTEM image of the double emulsion stabilized in Fig. 8B). A block copolypeptide concentration C = 1.0 mM and an oil volume fraction φ = 0.20 (10 cSt PDMS silicone oil) were used for 1 minute to produce a K ₆₀ (rac-V) ₂₀ CTEM image of double emulsion stabilized with (V = valine, FIG. 8C) and K ₆₀ (rac-A) ₁₀ (A = alanine, FIG. 8D). The scale of all images is 200 nm on the horizontal bar.

Figures 9A and 9B show a comparison of the emulsifying properties of the copolypeptides. FIG. 9A shows K ₆₀ L ₂₀ and K ₄₀ (rac-L) ₂₀ generated using an ultrasonic homogenizer at a block copolypeptide concentration C = 0.1 mM and an oil volume fraction φ = 0.20 for 1 minute. An image of an emulsion containing toluene as an oil phase using a surfactant. The image was taken after 3 hours had passed after emulsification and the K ₆₀ L ₂₀ sample showed clear phase separation (oil layer above). FIG. 9B is an image of an attempt to emulsify PDMS silicone oil and water using homopolypeptide K ₆₀ as a surfactant. In this sample, the phase separation is rapid and complete, and the homopolypeptide K ₆₀ does not provide sufficient stabilization of the oil-water interface and the droplets temporarily generated during excitation are Indicates a rapid coalescence.

10A-10C are plots of dynamic light scattering (DLS) data showing how the double emulsion droplet size is affected by different experimental parameters. All samples were generated using a microfluidic homogenizer (75 μm interaction chamber) under the following conditions. Number of passes N = 6, homogenizer input air pressure p = 130 psi. The diameter is measured using cumulant analysis of the DLS correlation function and is an estimate of the average diameter of the outer droplets of the water / oil / water double emulsion. FIG. 10A is a graph of measured average diameter of double droplet structures versus K ₄₀ (rac-L) ₂₀ block copolypeptide concentration C. FIG. 10B is a graph of measured average diameter versus oil volume fraction φ. FIG. 10C is a graph of measured average diameter of a double droplet structure versus hydrophobicity (rac-L) length obtained from different samples with varying _x of K ₄₀ (rac-L) _x .

FIGS. 11A to 11D are fluorescence microscope and CTEM images showing the effect on hydrogen bonding in the oil phase of an emulsion of silicone oil capped with acetamide groups (PBA). FIG. 11A is a fluorescence microscopic image of a water / oil / water double emulsion stabilized with fluorescently stained FITC-K ₆₀ (rac-L) ₂₀ (note: L-block is a racemate) containing multiple inner water droplets. (C = 0.1 mM, PBA oil volume fraction φ = 0.20, ultrasonic homogenizer used for 10 seconds). FIG. 11B shows a fluorescence microscopic image of an oil / water single emulsion stabilized with FITC-K ₆₀ L ₂₀ (Note: L-block is not racemic) (C = 0.1 mM, PBA oil volume fraction φ = 0.20, use ultrasonic homogenizer for 10 seconds). FIG. 11C is a CTEM image of nanoscale water / oil / water double emulsion droplets with multiple inner water droplets generated using PBA as the oil phase. FIG. 11D is a CTEM image of a nanoscale water / oil / water double emulsion droplet with a single inner water droplet using 300 cSt PDMS (same viscosity as PBA) as the control oil phase. The emulsion samples of FIGS. 11C and 11D were generated using K ₆₀ (rac-L) ₂₀ and using a microfluidic homogenizer (75 μm interaction chamber) under the following conditions. Number of passes N = 6, homogenizer input air pressure p = 130 psi, block copolypeptide concentration C = 1.0 mM, and oil volume fraction φ = 0.20. The scale of the horizontal bar is 5 μm in FIGS. 11A and 11B, and 100 nm in FIGS. 11C and 11D. PBA is bis [3- (acetamido) -propyl] -terminated polydimethylsiloxane (number average molecular weight Mn = 2500, viscosity 300 cSt).

FIGS. 12A-12C are cryogenic transmission electron microscope (CTEM) images of single and double emulsions stabilized with copolypeptides generated using a microfluidic homogenizer, which produce L-block racemic characteristics. How it affects the type of emulsion that Vitreous moisture becomes a thin background, and silicone oil having a high density of atoms with a high atomic number appears dark and has a contrast. The emulsion was produced under the following conditions. N = 6, p = 130 psi, C = 1.0 mM, and oil volume fraction φ = 0.20 (10 cSt PDMS silicone oil). FIG. 12A is a CTEM image of a water / oil / water double emulsion stabilized with K ₄₀ (rac-L) ₂₀ . FIG. 12B is a CTEM image of an oil / water single emulsion stabilized with K ₆₀ L ₂₀ . FIG. 12C shows low speed centrifugation and ultra high speed centrifugation from a double emulsion stabilized with K ₄₀ (rac-L) ₂₀ (Beckman's ultra high speed centrifuge is about 3,000 to 25,000 with a SW28 swing rotor. CTEM image of droplets isolated and size-sorted by use at a normal speed of rotation / min). The scale of all images is 200 nm on the horizontal bar.

FIGS. 13A and 13B are fluorescence microscopic images of double emulsions including polar and nonpolar cargos. Samples were generated using an ultrasonic homogenizer (10 seconds at 35% output) at φ = 0.2, C = 0.1 mM. The oil phase fluoresces blue due to the encapsulated pyrene (0.01M), and the inner aqueous phase fluoresces red due to the encapsulated InGaP quantum dots (concentration of 2 μM) when present. . The polypeptide fluoresces green because it is labeled with fluorescein (FITC). Prior to imaging, the droplets are dialyzed and subsequently diluted with pure water to remove most of the quantum dots, the red phosphor, from the outer continuous aqueous phase. FIG. 13A shows in oil-in-water stabilized with FITC-labeled K ₄₀ (rac-L) _{10 in} which both the pyrene (blue fluorescence) is incorporated in the outer oil droplet and the quantum dot (red fluorescence) is incorporated in the inner water droplet. Water droplet double emulsion. FIG. 13B is an oil-in-water emulsion stabilized with FITC-labeled K ₆₀ L ₂₀ with pyrene (blue fluorescence) incorporated in the oil droplets. Since K ₆₀ L ₂₀ forms a direct emulsion, no red fluorescence is seen in the droplets, confirming the absence of inner water droplets in this particular composition. The scale of both images is 5 μm on the horizontal bar.

FIG. 14 shows a circular dichroism spectrum of a block copolypeptide solution (1.0 mg / mL) in ultrapure water. The minimum values of 208 nm and 222 nm of sample (rac-K) ₆₀ L ₂₀ are characteristic of the α helix structure. The black rectangle (♦) is (rac-K) ₆₀ L ₂₀ , and the white angle (□) is (rac-K) ₄₀ (rac-L) ₂₀ .

  An emulsion is a dispersion of droplets of one liquid phase material in another immiscible liquid phase material and can generally be formed via flow-induced fracture from large droplets to smaller droplets . Surfactants are composed of surface-active amphiphilic molecules, are soluble in at least one liquid phase, are easy to adsorb at the interface between two immiscible liquids, and the subsequent droplets. Are usually added to prevent coalescence (ie, coalescence) and to maintain the droplet size distribution over time. Simple emulsions are generally classified into oil-in-water droplets (ie, oil / water, or “direct”) and water-in-oil droplets (ie, water / oil, or “reverse”), and these different forms are sufficient It can be obtained using a suitable surfactant that provides stability and may be affected by the order of the additive components in the shear.

  As used herein, the prefixes “racemic-”, “r”, “r-”, “rac-”, and similar common abbreviations are the racemic forms of amino acids, oligopeptides and polypeptides ( Used interchangeably in the sense of racemization. Similarly, “Cryo-CTM” and “CTEM” mean a cryogenic transmission electron microscope. The variables “p” and “P” are used interchangeably in the meaning of the input gas pressure of the microfluidic homogenizer, and “φ” and “Φ” are used interchangeably in the meaning of the total oil volume fraction.

  Microscale droplet oil-in-water emulsions are a common product and have been made for a long time. A simple example is mayonnaise, which is generally made by adding olive oil in small amounts to a yolk containing stabilized and amphipathic lipids and protein molecules while stirring vigorously with a whisk or spoon. As the droplet breaks up into smaller droplets, some mechanical shear energy is stored in the interfacial region of the additionally generated droplet. In typical mechanical devices, it is possible to create shear rates that achieve droplet breakage with droplet sizes typically up to about 300 nanometers, but to achieve a reduction in the peak in particle size distribution below this limit. It is difficult. Historically, submicron emulsions are known as “miniemulsions” and have been manufactured using microfluidic and ultrasonic means in the last 20 years or so. As used herein, “emulsification” refers to the excitation of two immiscible liquids (each including mixing, fusing and floating of additional components) placed in close proximity and / or in contact with each other. Introduce some form of non-thermal energy that excites and crushes the interface between two liquids so that one immiscible liquid forms separate droplets substantially surrounded by another immiscible liquid It is used in a broad sense that can include processing. During emulsification, large droplets are broken into smaller droplets than usual (eg, via interfacial “capillary” instability that occurs when large droplets are severely deformed), which adds additional interfacial area. It is formed. Furthermore, during emulsification, a single emulsion, a double emulsion, a higher order multiple emulsion, or a combination thereof can be formed. The method of emulsification described above can result in extreme shear, or flow rate, that allows very small droplets to stretch and break. Certainly, there are reports on the use of ultrasonic dispersers and microfluidic homogenizers that droplets in the nanoscale region with an average droplet size of less than 100 nm were obtained. Although it is unclear whether this "particle size" means radius or diameter, it takes into account the wide range of droplet sizes that exist from 2 to 3 nm on the micelle scale to macroscopic dimensions Then, these two factors are minor problems.

  In an embodiment of the present invention, it is shown that a single component synthetic amphiphilic diblock copolypeptide surfactant can be used to produce a water / oil / water double emulsion with a simple process and can be stabilized over a long period of time. These surfactants also stabilize against the extreme flow of droplets, direct production of robust water / oil / water double emulsions with nanoscale inner and nanoscale outer droplets, And is suitable for the application of nanostructure encapsulation in food, cosmetics and drug delivery.

  In an embodiment of the invention, the amphiphilic diblock copolypeptide can also function as a surfactant at the water-oil interface and has self-organizing properties that reflect the tendency of vesicle formation, so The possibility of producing a stable double emulsion was investigated using one interfacial agent that is not biased towards limited shear and complex droplet topologies.

  In embodiments of the present invention, it has been found that double emulsions and double nanoemulsions can be produced with direct emulsions and nanoemulsions stabilized with amphiphilic diblock copolypeptides. In embodiments of the present invention, the preferred form after shearing application shows the result that it is a double emulsion in a wide range of molecular weights of hydrophilic and hydrophobic blocks. Double emulsions, for example, can package both water-soluble and oil-soluble drugs and can provide a means for drug delivery. In addition, copolypeptides that stabilize double emulsion droplets can be designed and tailored to provide the desired biochemical interactions such as biological cell targets, cell membrane and intracellular membrane division, and enzyme function. And the delivery and performance of drug molecules that can be incorporated into the droplet structure can be improved.

  The method for producing an emulsion, the produced emulsion, and the droplet structure in the emulsion according to an embodiment of the present invention are schematically shown in FIGS. 2C and 2D. According to an embodiment of the present invention, the method comprises the steps of providing a first liquid and a second liquid, the first liquid being immiscible with the second liquid, and selecting Adding an amount of the block copolymer to at least one of the first liquid and the second liquid, and creating a plurality of droplets of the first liquid dispersed in the second liquid Emulsifying the liquid in the second liquid. Block copolymers act to stabilize multiple droplets against coarsening or other structural evolution that can occur through coalescence or other destabilization mechanisms. The block copolymer can be, but is not limited to, a block copolypeptide. Furthermore, block copolypeptides can be formed from naturally occurring and / or synthetic monomers. According to this embodiment, the first and second liquids can be, for example, oil (eg, nonpolar) and water (eg, polar) or vice versa. However, the present invention is not limited to oil and water as the immiscible liquid pair. According to other embodiments of the present embodiment, other polar and nonpolar liquid materials that are immiscible (eg, immiscible equipotential fluorinated and hydrocarbon oils) may be used. Thus, the terms “hydrophobic” and “hydrophilic” as used herein and in the claims refer to relative differences in molecular interactions between different types of immiscible liquids or immiscible liquid substances. Broadly mean.

  The emulsion in an embodiment of the present invention includes a substantially continuous liquid medium and a plurality of droplet structures dispersed in the substantially continuous liquid medium. 2C and 2D show two examples of emulsions, FIG. 2C shows a double emulsion, and FIG. 2D shows a direct emulsion. However, according to other embodiments of the invention, higher order emulsions may also be included. The droplet structure in the embodiment of the present invention includes an outer droplet of a first liquid having an outer surface and an inner droplet of a second liquid in the first droplet, wherein the second liquid is The liquid droplet is immiscible with the first liquid, and the inner droplet and the outer droplet include an inner droplet having an interface region therebetween. The droplet structure also includes an outer layer of block copolymer disposed on the outer surface of the outer droplet and an inner layer of block copolymer disposed in a boundary surface region between the outer droplet and the inner droplet. . The term “arranged” means a general term and may include, but is not limited to, the meaning of adsorption to a surface. For example, the block copolymer may have a portion that extends into the portion of the droplet, such as the droplet shown schematically on the right side of FIGS. 2C and 2D, and another portion that extends outside the portion of the droplet in the surface region. Can have a part. The term “layer” in a broad sense includes a state in which the block copolymer is loosely disposed in the surface area of the droplet, where the layer is permeable and the layer is completely enclosed. It may include a state where no surface is formed. The block copolymer can include a hydrophilic polymer block and a hydrophobic polymer block, which together act to stabilize the droplet structure. The block copolymer layer is shown schematically and may not be an actual measure. According to an embodiment of the present invention, the first liquid is immiscible with the substantially continuous liquid medium.

According to an embodiment of the present invention, in most compositions that form a stable double emulsion, the block copolymer disposed on the interface has an equilibrium thermal fluctuation k _B T (k _B is Boltzmann constant, T Yields repulsive potential energy of interaction between the inner droplet interface and the outer droplet interface that contains it, which is significantly stronger than the “thermal energy” corresponding to the temperature. In addition, in most compositions that form a stable double emulsion, the block copolymer is a repulsive potential energy of interaction between the outer droplet that is significantly stronger than the thermal energy and the interface of the other outer droplet that contacts it. Also brings. In some of the compositions that form stable double emulsions, block copolymers provide repulsive potential energy of interaction between the interfaces of multiple inner droplets in the outer droplets that is significantly stronger than thermal energy. Can do. Despite the repulsive potential energy of the aforementioned interaction, there can also be an attractive potential energy of interaction between the liquid interfaces. The attractive potential energy of this interaction does not cause agglomeration of outer droplets, inner droplets, or combinations thereof, in single, double, and multiple emulsions, causing coalescence, membrane disruption, and droplet structure. Can be caused without destroying integrity. Such interaction of attractive potential may cause formation of a secondary minimum in the interaction potential between the droplet interfaces, but does not necessarily mean that the droplet structure is destabilized. One example of an attractive potential energy for such interaction is the depletion attraction that can occur between the outer droplets as a result of the excessive content of copolymer present in the continuous liquid phase.

  In a water / oil / water double emulsion, the interfacial stability of the oil film between the inner water-oil interface surface and the outer oil-water interface surface caused by adsorption of amphiphilic molecules at the interface is Although it may be important to ensure the long term stability of the droplets against the evolution of the outer droplet size, additional potential factors may affect the long term stability of the droplets. One potential factor is the presence or absence of potential osmotic pressure within the double emulsion droplets and / or osmotic pressure due to the hydrophilic and / or hydrophobic content of the substance incorporated into the liquid phase. . For example, in some methods of making a double emulsion, the inner water droplets can contain an excess of copolypeptides, some of which are not only the water-oil interface on the surface of the inner droplets, but also the inner liquid. Also present in the aqueous phase of the drop. This excess polymer can create osmotic pressure. Occasionally, having an osmotic pressure created from such water-soluble and / or water-dispersed materials is desirable for droplet stabilization against long term coalescence processes such as Ostwald ripening. Another potential factor is the potential presence of dissolved substances that can create osmotic pressure in the continuous aqueous phase outside all double droplets. Yet another potential factor is the potential presence of oil-dissolving materials and / or oil-dispersing materials that can create osmotic pressure in the outer oil droplets. The relative differences in these potential osmotic pressures, as well as the relative solubilities of oil, water and other materials in each of the other materials, can affect the migration of materials that can change the size of the inner and outer droplets. There is sex. Long-term observation of several double emulsions has shown that significant stability of both the inner and outer droplet size can be achieved in embodiments of the present invention.

  At the same time as or after emulsification of the double emulsion droplets, the liquid material of the inner droplet can be changed and used to cause solidification of the inner droplet material, otherwise causing an elastic structure. At the same time or after emulsification of the double emulsion droplets, the liquid material of the outer droplets can be changed and used to cause the outer droplet material to solidify or otherwise cause an elastic structure. Simultaneously with or after emulsification of the double emulsion droplets, the continuous liquid material outside the double droplets can be changed and used to solidify the otherwise continuous liquid material or otherwise cause an elastic emulsion structure. At the same time as or after emulsification of the double emulsion droplets, it is possible to change the liquid material of the inner droplet, the liquid material of the outer droplet, the liquid material of the continuous phase, or a combination thereof, and solidify the double droplet structure. Can be used to cause structural changes and / or elasticity. These changes can be structural changes and / or phase changes (eg, induced by temperature changes), gelation, cross-linking, polymerization, photopolymerization, chemical reaction, dissolution and / or increased volume fraction of dispersed species (eg, Transport of low molecular weight substances in the inner and / or outer droplets), jamming of dispersed species, vitrification of dispersed species (eg, induction between dispersed species), and solidification induced by self-assembly obtain. Similarly, the structure that affects the elasticity of the layer of amphiphilic molecules adsorbed on the interface of the inner and / or outer droplets can be changed and controlled simultaneously with or after emulsification of the double emulsion droplets. Such changes can be achieved by the selection of amphiphilic molecules that can crosslink creating an elastic layer at the interface of the inner and / or outer droplets. Such cross-linking can be induced by electromagnetic radiation, heat, chemical reaction, or combinations thereof.

  There are many types of drug molecules that can be classified in different ways by emphasizing different criteria. Some drug molecules are hydrophobic, some drug molecules are hydrophilic, and some drug molecules are also extremely amphiphilic. By reference to drug molecules, the present invention includes, but is not limited to, all types of molecules that can be used to interact and influence viability and biological function and biological presence. , Biomolecules, subcellular structures, biological membranes, cytoplasm, nucleus, extracellular matrix, organelles, cells, synapses, cellular tissues, organs, and organisms.

  A drug, such as a drug molecule or a composition of multiple drug molecules, can be incorporated into the liquid phase of emulsions, double emulsions, and multiple emulsions, including but not limited to antiperspirants, antipruritics, Anti-infective, anti-inflammatory, anti-arthritic, anti-synovitis, anti-acne, anti-acne, headache, migraine, anti-influenza, antidepressant, antidiabetic, antiviral, antifungal Drugs, anti-MRSA (methicillin-resistant Staphylococcus aureus) drugs, antibiotics, anti-bacterial drugs, anti-microbial drugs, anti-appetite drugs, anti-nutritive drugs, anti-AIDS (acquired immune deficiency) Syndrome), Anti-HIV (Human Immunodeficiency Virus), Anti-Herpes, Anti-Hepatitis, Anti-Spirochete, Anti-Lyme Disease, Anti-cholesterol, Anti-dandruff, Hair loss, Anti-dermatitis, Anti-swelling Drugs, anti-addiction Drug, antidementia drug, anti-Alzheimer drug, anti-Parkinson drug, anti-prion drug, anti-urinary tract infection drug, anti-schizophrenia drug, anti-manic drug, anthelmintic drug, anti-cancer drug, anticonvulsant drug, anti-epileptic drug Drugs, antidepressants, anti-anxiety drugs, antihistamines, anticoagulants, antiseptics, antibacterial agents, antituberculosis drugs, anti-insomnia drugs, antifibromyalgia drugs, anti-incontinence drugs, anti-dermatitis drugs, anti Antiangiogenic, antiallergic, antihayfever, antiasthmatic, antihypertensive, anticoagulant, motion sickness, antibody weight increase, antibody weight decrease, anti-obesity, antiflatulence, belching Suppressor, anti-constipation, antimalarial, anti-warm, skin burn, skin tan, anti-cutaneous epilepsy, anti-urticaria, anti-conjunctivitis, anti-skin swelling, anti-herpes simplex, antipsychotic, Anti-skin cancer drug, anti-eczema drug, anti-anemic drug, anti-jaundice drug, anti-encephalitis drug, anti-dementia drug, anti-menstrual pain drug Anti-chlamydia infection drug, anti-protozoan drug, antithrombotic drug, anti-toothache drug, anti-ear pain drug, anti-tuberculosis drug, anti-bronchitis drug, anti-pneumonia drug, anti-polio drug, anti-tetanus drug, anti-disease drug Anti-attention deficit disorder drug, anti-lip roughening drug, anti-osteoporosis drug, anti-cardiology drug, anti-heart attack drug, anti-heart failure drug, anti-stroke drug, anti-arrhythmic drug, anti-peripheral arterial drug, anti-platelet drug, anti-anginal Drugs, rejuvenation drugs, anti-memory loss drugs, anti-hypertensive drugs, anti-psoriatic drugs, anti-anorexic drugs, anti-diarrheal drugs, anti-gout drugs, anti-thyroid function drugs, anti-organ transplant rejection drugs, anti-parasitic drugs, Anti-erectile dysfunction drugs, anti-vaginitis drugs, anti-hot flashes, insect and spider repellents, anesthetics, hormones, enzymes, catalysts, inhibitors, promoters, moisturizers, vitality enhancers, skin regenerative agents, skin regrowth Agent, hair restorer, hair growth agent, attention enhancer, muscle strength enhancer, male energy enhancer, female pregnancy promoter, contraceptive, decongestant, hemp Drugs, eye treatments, smoking cessation drugs, nicotine replacement agents, penicillin related drugs, cephalosporins related drugs, sulfa related drugs, mycin related drugs, endocrine drugs, cardiovascular drugs, pulmonary drugs, central nervous system drugs, gastrointestinal drugs , Muscle relaxants, sedatives, tranquilizers, hypnotics, analgesics, general anesthetics, vaccines, menopause related drugs, and diuretics.

  Contrast agents that can be introduced into the liquid phase of emulsions, double emulsions, and multiple emulsions are not limited, but include magnetic resonance imaging (MRI) contrast agents, X-ray computed tomography (CT) contrast agents, positron emission tomography ( PET) contrast agents, ultrasound image contrast agents, and optical image contrast agents.

  Non-thermal energy means all forms of energy that are not related to the equilibrium fluctuations of the components of the emulsion system, whether the emulsion system is a single emulsion or a double emulsion. For example, out-of-equilibrium imbalances at local concentrations of emulsion-based component materials can result in the formation of one liquid phase droplet within another immiscible liquid material without the direct application of external viscous flow. Entropy-driven stresses that are strong enough to cause This type of “spontaneous emulsification” occurs due to local differences that can be strong enough to drive droplet formation in the chemical potential of the components within the emulsion system. Therefore, although there may be an argument in this classification in the prior art, it is considered that a reconstruction process of “spontaneous emulsification” occurs as one form of non-thermal energy. In addition, "spontaneous emulsification" and other non-equilibrium imbalances in the chemical potential of species within the emulsion system can also be used to drive the formation of double emulsions stabilized with copolypeptides. It is therefore considered to include entropy-driven stress as a form of non-thermal energy that causes spontaneous emulsification and other non-equilibrium transport processes (such as exothermic and convective chemical reactions).

  FIG. 2C shows an example of producing a double emulsion in an embodiment of the present invention. FIG. 2D shows an example of single emulsion production in an embodiment of the present invention. The present invention is not limited to direct and double emulsions only and is not limited to double emulsions having only one inner droplet. Tertiary and higher order emulsions are also within the scope of the present invention. Furthermore, double emulsions having one, two, or more than one droplet within a large droplet are also within the scope of the present invention. 2C and 2D, double and direct emulsions after step i are further reduced in droplet size (eg, FIG. 2C and FIG. 2D) with a microfluidic homogenizer (Microfluidizer (r) 110S equipped with a 75 μm microchannel interaction chamber). (See after step ii). Various additional treatments after the initial emulsification can also be performed within the scope of the present invention.

The amphiphilic block copolypeptide K _x rL _y (rL (or equivalently rac-L) represents the racemic oligoleucine region) is obtained using transition metal mediated polymerization of α-amino acid N-carboxylic anhydrides. Synthesized (TJ Deming, Macromolecules 32, 1999, p. 4500). The block copolypeptide consists of a block of random coiled positively charged poly L-lysine bound to a block of racemic oligoleucine lacking a stable secondary structure (FIG. 2A). According to an embodiment of the present invention, the formation of the emulsion begins with dissolving the block copolypeptide in water at the desired concentration (C), and subsequently to a specific final oil volume fraction φ. Oil was added to (Figure 2C). In general, for copolypeptides with racemic hydrophobic blocks, polydispersity ranging from 1 to 20 μm particle size by applying shear using a hand-held rotary shear (IKA Ultra-Turrax T8 with S8N-8G dispersive element) A microscale premixed emulsion consisting of a system (water / oil / water) double emulsion droplets was formed (eg, after step i in FIG. 2C). (Note that in an embodiment of the present invention, a double emulsion at this stage was obtained without a two-stage emulsification or microfluidic emulsifier as described in the prior art process.) The premixed emulsion is fed into a high pressure microfluidic homogenizer (eg, Microfluidizer (r) model 110S) that typically has an input gas pressure p = 130 psi (corresponding to a fluid pressure in the interaction chamber that is approximately 240 times the input gas pressure) And large droplets were sheared into submicron and nanoscale droplets (eg, after step ii in FIG. 2C). Optionally, the resulting submicron and nanoscale emulsions can be reintroduced multiple times N (N is an integer number of passes) into the microfluidic homogenizer to obtain more monodisperse droplets. . This method is a simple method of producing large quantities of submicron and nanoscale double emulsion droplets (FIG. 2C). This emulsification method usually emulsifies in N microfluidic homogenizers in separate passes, but is suitable for continuous recirculation emulsification of the emulsion through the interaction chamber (ie continuous recirculation emulsification). There is another way. The use of multiple passes and / or recirculation can achieve the desired result of reducing the overall diameter of the liquid structure and reducing the polydispersity of the droplet size distribution. Similarly, by changing the hydrophobic block of the copolypeptide to a non-racemic form by controlling and adjusting the polymer synthesis, followed by the same physical emulsification process, a direct oil-in-water emulsion coated with the copolypeptide is obtained. Can be formed (FIG. 2D).

A cryogenic transmission electron microscope (Cryo-TEM or CTEM) is used to observe and image both double and single emulsion droplet structures, which rapidly change to glassy with ice, without using staining agents. Can be used for The images show that double emulsions were indeed formed with various K _x rL _y 1.0 mM polypeptide surfactants (FIGS. 3A-D). Also, particularly in the K ₄₀ rL ₂₀ and K ₄₀ rL ₃₀ Cryo-TEM images, there are a large number of droplets with diameters of 100 nm and below (FIGS. 3C and 3D, respectively). This is surprising because the concentration of the block copolypeptide in solution is relatively low. Furthermore, the emulsions created in the embodiments of the present invention show an interesting trend for inner droplets. Many liquid and copolypeptide compositions that have passed through a microfluidic homogenizer have only one aqueous droplet formed per oil droplet. The efficiency of this process is very high (> 95%). From these images (FIGS. 3A-D), it can be seen that in these samples, all double droplets have a relatively constant ratio of inner and outer droplet radii. FIG. 3F shows a histogram representing details of the observation probability of a dimensionless ratio (ie, “I / O ratio”) obtained by dividing the radius a _i of the inner droplet by the radius a _o of the outer droplet that contains it. Indicates. The histogram shows a constant average value of (a _i / a _o ) ≈0.5 (ie 50%) corresponding to a unimodal peak of K ₄₀ rL ₁₀ . Certainly, variations in a _i and a _o are seen with the droplets, but this average value of (a _i / a _o ) ≈0.5 was also observed in the double emulsions of other compositions imaged. . In addition, Dynamic Light Scattering (DLS) results in hydrodynamic radii of emulsions made with various block copolypeptides, resulting in submicron droplet formation in a wide range of copolypeptide compositions. (FIGS. 3E, 3G, and 3H).

Control of droplet size is an important issue in drug delivery applications. According to the embodiment of the present invention, there are three main means for controlling the particle size of the double emulsion. The first method is the manipulation of emulsification conditions via the energy of non-thermal excitation (eg, application of shear and elongational flow stress), fluid flow properties (eg, viscosity or viscoelasticity), and interfacial tension between the fluids. Is due to. The second method involves centrifugal separation, particle size separation performed after emulsification such as filtration, and sorting of droplets in a pre-generated emulsion. The third method is to alter the composition and concentration of the block copolypeptide through synthesis. This third method also indirectly provides a means of altering important physical properties, including the solubility of the copolypeptide in the liquid, the interfacial tension between the liquids in the presence of the adsorbed copolypeptide, Examples include the viscosity of a lysate containing a copolypeptide, the structural form of each block of the copolypeptide that provides interfacial stabilization that maintains droplet stability and inhibits coalescence of the interface. Chemical processing is used to synthesize copolypeptides, but control of copolypeptide production can also be achieved through other means such as genetic expression in bioreactors containing genetically modified bioorganisms. It is. It is capable of producing not only small double emulsion droplets (submicron outer droplets and even smaller inner droplets) but also large double emulsion droplets (> 1 μm) as described above. Microscale emulsion droplets can be made at low flow rates obtained from hand-held homogenizers, or at somewhat higher flow rates via ultrasonic homogenization (eg, use of an ultrasonic homogenizer). When emulsifying an emulsion of K ₄₀ rL ₁₀ copolypeptide identified with 0.1 mM fluorescein isothiocyanate (FITC) using ultrasonic homogenization, the laser confocal scanning microscope (LCSM) can be used in the range of 1 μm to 20 μm. It has been found that larger emulsion droplets can be formed. This large double emulsion droplet solution can also be further emulsified by passing it through a microfluidic homogenizer to form smaller double emulsion droplets (FIG. 4B).

In certain applications, further particle size separation may be desired. For these applications, centrifugation may be used to fractionate the emulsion and isolate the emulsion in the desired particle size range. To achieve such a separation, a 1.5 mM K ₄₀ rL ₂₀ emulsion (φ = 0.2) passed through a microfluidic homogenizer 6 times (N = 6) at a low speed of 3500 rev / min (rpm ) For 4 hours in a tabletop centrifuge set to Due to the difference in mass density of the droplet structure relative to the continuous liquid phase, larger droplets rise faster to the top as plugs and easily from the extremely dilute suspension of small droplets below (ie, residue) Can be separated. Droplets having a diameter greater than 300 nm could be separated. Since the remaining suspension contained droplets with a diameter of 300 nm or less, therefore, higher speed centrifugation was required for further droplet fractionation. The remaining suspension was placed in an ultra high speed centrifuge and centrifuged at 20,000 rpm for 24 hours. The Cryo-TEM images of these layers show that the droplet size can be separated into a very narrow size range (FIGS. 4C and 4D). The stopper formed on the top of the centrifuged sample has an outer droplet diameter in the range of about 30 nm to 200 nm (FIG. 4C), and the remaining suspension has an outer droplet diameter in the range of about 10 nm to 30 nm. This is shown (FIG. 4D). This fractionation procedure reveals that isolation of emulsion droplets of the desired particle size of 10 nm to 10 μm is completely feasible. Through this centrifugation procedure, increasing the volume fraction of the oil droplets, including the oil droplets in the oil-in-water emulsion and the inner water droplets in the water-in-oil-in-water double emulsion, can be applied to either the inner or outer droplet interface. Clarified that it is possible without destabilization.

Another means of controlling the droplet size of the double emulsion is through block copolypeptide modification. A simple way to do this is by changing the concentration of the polypeptide. Dynamic scattering (DLS) results show that when the concentration of K ₄₀ rL ₂₀ copolypeptide is increased from 0.1 mM to 1.5 mM, the average droplet radius is about 400 nm to 1.5 mM at 0.1 mM. It is shown that it decreased to about 160 nm. Another way to reduce the size of the emulsion droplets is to increase the length of the copolymer oligoleucine fragment. Of oligoleucine length, while keeping the length of the lysine the same _{(K 40),} when the _K 40 rL ₅ to _K 40 _{rL 30,} the particle size of the outer oil droplets on average was reduced from about 470nm to about 320nm .

Vesicles consist of a lamellar membrane that separates the inner aqueous compartment from which the inner liquid can function as a container for hydrophilic loads from the outer continuous liquid. Similarly, double emulsions encapsulate inner aqueous droplets using a relatively thick oil film that exists between amphiphilic molecular layers at two separate oil / water interfaces. One advantage of this system is that a thicker oil film (referred to herein as an “oil layer”), located between the inner and outer droplet interfaces, can act as a container for hydrophobic loads. To demonstrate this idea, both water-soluble and oil-soluble fluorescent markers were incorporated into copolypeptide stabilized emulsions. The water-soluble fluorescent marker was InGaP / ZnS quantum dots having an emission wavelength of 630 nm (red), and the hydrophobic fluorescent marker was pyrene because of its high solubility in silicone oil and blue fluorescence. Furthermore, by stabilizing the emulsion using a copolymer of K ₄₀ rL ₁₀ that has been FITC-functionalized with a green fluorescent label, it is possible to simultaneously image the localization of the copolypeptide along with both hydrophilic and hydrophobic markers. It can be done. Fluorescence LCSM images of 0.1 mM FITC labeled K ₄₀ rL ₁₀ emulsion without pyrene and quantum dots show large double emulsion droplets with a diameter of about 1 μm to about 5 μm (FIG. 5A). The three labeled emulsions were obtained by adding K ₄₀ rL ₁₀ labeled with 0.1 mM FITC to 0. 0 in ₁₀ cSt silicone oil (φ = 0.2) in the presence of InGaP / ZnS quantum dots. Made by emulsification with 01M pyrene. Three different fluorescent dyes were imaged using fluorescence overlay microscopy. Overlay fluorescent images show the separation of hydrophilic quantum dots (red) into the inner aqueous liquid, the separation of hydrophobic pyrene (blue) into the oil liquid, and FITC-labeled copolypeptide (green ) (FIG. 5B). The label at the interface of the inner droplet is not visible, but is likely due to the disappearance of the FITC labeled copolypeptide fluorescence by the quantum dots contained in the inner droplet. This hypothesis is supported by the fact that FITC fluorescence around the inner droplet is seen in the LCSM image of the FITC-labeled K ₄₀ rL ₁₀ emulsion without quantum dots (FIG. 5A).

The synthetic methods of the invention can be used to alter the composition and conformation of a copolypeptide, and other amino acids can be incorporated into the polypeptide chain. In order to demonstrate the effect of the change in chain conformation, a racemic oligoleucine fragment randomly copolymerized as K ₄₀ rL ₁₀ is mirror image of adopting a stable α-helix structure as K ₆₀ L ₂₀ The hydrophobic region was changed to an isomerically pure oligoleucine fragment. LCSM images of emulsions created by sonication of both of these FITC labeled 0.1 mM polypeptides show that both samples formed similar double emulsions (FIGS. 6A and 6B). ). It is also important to note that the formation of double emulsions is not limited to block copolypeptides that include poly L-lysine as the hydrophilic block, but can be formed, for example, with hydrophilic blocks of negatively charged poly L-glutamine. It is. An emulsion of 1.0 mM E ₄₀ rL ₁₀ copolypeptide was generated using a microfluidic homogenizer. The Cyro-CTEM image of this sample shows that a double emulsion was formed as with the block copolypeptide K ₄₀ rL ₁₀ (FIGS. 6C and 6D). Furthermore, an emulsification was attempted using homopolymer K ₆₀ that does not contain a hydrophobic region, but no emulsion was formed after sonication (FIG. 6E). K ₆₀ has good water solubility, but lacks a hydrophobic block, so it cannot be expected to have strong amphiphilic properties. In addition, an aqueous solution of K _x rL _y copolypeptide was brought into contact with the oil layer, and it was observed whether or not a double emulsion spontaneously formed without application of shearing. However, spontaneous formation was observed even after a one-week culture period. There wasn't.

(Additional features and changes)
Copolypeptide Stabilized Emulsions There are a number of potential compositional changes that can be used in the basic process of the present invention to make simple and double emulsions consisting of droplets with microscale, sub-microscale, and nanoscale radii . The basic elements of the treatment according to the embodiment of the present invention include a first liquid (eg, water), a different second immiscible liquid (eg, oil), and one of at least two liquids, Or it is an amphiphilic copolypeptide which has remarkable solubility (for example, water solubility) in both. The copolypeptide is added to at least one soluble liquid, supplying non-thermal energy that disturbs the interface between the two liquids to the liquid and copolypeptide system, via droplet formation and metastable emulsion formation. Growing the irreversible final interface surface area. The applied non-thermal energy can be supplied in a number of different forms, supplied via mechanical shear flow, ultrasonic, electromagnetic and electromagnetic waves, gravity, and concentration gradients, or via pressure drops that cause elongational flow Is included. When the interface between liquids is stretched by non-thermal energy that causes emulsification, the interface becomes unstable due to capillary instability, leading to the breakdown of larger droplets or smaller droplets of the film. Depending on the type of liquid and the composition and structure of the copolypeptide that stabilizes the interface, these small droplets may contain inner droplets of other liquid phases (eg, the formation of water / oil / water double emulsions) There is not.

  In order to load the desired cargo on the inner droplets of the water / oil / water double emulsion, it is possible to include a number of different dissolved and dispersed desired loading elements in the continuous liquid phase prior to emulsification. it can. In the most common case investigated, the continuous liquid phase is water. In this case, the following types of loads can be loaded in the aqueous inner droplet (and in the continuous aqueous phase). This includes single stranded DNA, double stranded DNA, single stranded RNA, double stranded RNA, mRNA, tRNA, rRNA, miRNA, siRNA, piRNA, rasiRNA, tasiRNA, hcRNA, scnRNA, RNA polymerase, nucleotide, oligo Nucleotide, transposon, peptide, oligopeptide, polypeptide, protein, microtubule, actin filament, intermediate filament, bundled protein, cross-linked protein, transfection agent, salt, anion, cation, acid, group, buffer, virus , Vitamins, serum, lysates, ATP and GTP (eg, molecular energy sources), molecular motors, hydrophilic drug molecules, cells, vesicles, nanodroplets, nanoemulsions, fullerenes, single and multi-walled carbon nanotubes, cytoplasm Ribosome, enzyme, glucose, Golgi, dendrimer, surfactant, lipid, lipoprotein, oligonucleotide peptide copolymer, globulin, albumin, human serum albumin, bovine serum albumin, saccharide, emulsan, saccharide, oligosaccharide, Polysaccharides, biocompatible polymers, biodegradable polymers, quantum dots, clay nanoparticles, metal nanoclusters and nanoparticles, magnetically sensitive iron oxide nanoparticles, organic and inorganic nanospheres and nanoparticles, isotope substituted hydrophilic There are sex molecules, contrast agents, and fluorescent dyes. A mixture in the continuous phase of these components can also be produced, provided that it is stably dispersed. In a water / oil / water double emulsion stabilized with an amphiphilic copolypeptide, it is smaller than the final droplet size (or can be compressed to a volume smaller than the inner water droplet volume) and in the aqueous phase A wide range of hydrophilic materials that prefer to exist and water-dispersed materials can be incorporated into the inner water droplets.

  In the case of a water / oil / water double emulsion, the composition of the dispersed material within the inner water droplets is determined by the composition of the aqueous liquid prior to the application of non-thermal energy (ie emulsification) that disturbs the interface between the liquids. After emulsification, the inner water droplet contains the same components as the outer continuous water portion. Once emulsification is complete, the outer water portion can contain valuable components and can be separated and retained from the droplets. Following this separation, the double emulsion is placed in a different continuous aqueous liquid containing the block copolypeptide and possibly another surfactant suitable for maintaining droplet stability over time in the desired product. Can be re-dispersed. By this method, the composition of the continuous aqueous liquid and the composition of the inner water droplet (that is, the inner side of the oil droplet) can be set differently. For example, the inner water droplets can contain the desired drug molecules and particles at the desired concentration, and the continuous aqueous phase need not necessarily contain them.

  The second immiscible liquid (eg, oil) can also include a wide range of different molecules, macromolecules, and particulate matter. When the second liquid is hydrophobic (eg, oil), the following can be taken into the liquid droplets dispersed. This includes fats, lipids, waxes, natural oils, essential oils, fragrances, cholesterol, steroids, hydrophobic drug molecules, hydrophobic polymers, hydrophobic polypeptides, poly (lactic acid), poly (lactic acid-co-glycolic acid) , Poly (lactic acid-glycolic acid), biocompatible polymer, biodegradable polymer, micelle, quantum dot, nanoparticle, nanocluster, carbon nanotube, fullerene, magnetic fluid, contrast agent, fluorescent dye, and liquid crystal . In the case of a water / oil / water double emulsion, the oil can contain oil-soluble drug molecules and indicators that surround the inner water droplet and, in conjunction with the contents in the water droplet, promote and / or improve the desired function. .

  The liquid part of the emulsion and / or droplets can be changed to a solidified or liquid crystal part after emulsification. When a polymerizable oil (eg, a silicone oil that can be cross-linked with UV light) is used, the oil can be made into a hard cross-linked polymer by exposing the emulsion or double emulsion to UV light. Alternatively, if the oil is paraffinic, the liquid oil can be solidified by cooling to below the solidification temperature of the paraffin after forming the emulsion or double emulsion.

  The ability to form stable emulsions or double emulsions is not limited to 10 cSt PDMS silicone oil. It has been found that stable emulsions and stable double emulsions are formed in other silicone oils having kinematic viscosities ranging from about 0.65 cSt to 1000 cSt at room temperature, corresponding to viscosities ranging from about 1 cP to about 1000 cP. . In another embodiment of the invention, this viscosity range can be expanded from about 0.1 cP to over 10,000 cP. In general, heating the liquid reduces the viscosity, so it can be assumed that emulsification at high temperatures can be used to obtain the desired emulsion composition (eg, high viscosity oil) and structure (eg, reduction in droplet size). Natural oils including soybean oil and methyl oleate can also be emulsified with the copolypeptides of the present invention. Organic solvents such as toluene, dichlorobenzene, and dodecane were also emulsified with the block copolypeptide in the continuous phase of water.

Using oil volume fraction φ in the range of very dilute limit (eg 10 ⁻⁵ ) to a concentrated region above 0.9, stable droplets in oil / water emulsions, and water / oil / water double emulsions A stable double droplet could be produced. Usually, for the formation of oil / water emulsions or water / oil / water double emulsions, the emulsification is carried out at φ <0.5, more generally oil / water emulsions and water / oil / water doubles. The emulsion is carried out at φ≈0.1 to φ≈0.2. Although higher φ is desirable because it increases the throughput of droplet production in the emulsification process, the average size of the droplet structure can also depend on φ. The radius and volume fraction of the inner droplets could also be varied over a wide range, and regular direct and double emulsions with radii ranging from microscale to nanoscale could be made.

  A number of different types of equipment and equipment can be used to provide energy that disturbs the interface to make an emulsion or double emulsion. These include colloid mills, mixers, agitators, homogenizers, ultrasonic dispersers, magnetic dispersers, electromagnetic dielectrophoretic excitations, microfluidic devices, and porous membrane injection. Studies have shown that stabilization of copolypeptides can be accomplished using a variety of different methods of supplying non-thermal energy excitation that disrupts the interface, providing the same emulsion form provided sufficient energy is provided to significantly disrupt the interface. It is shown that. It has been shown that water / oil / water double emulsions of the same composition containing copolypeptides can be produced using a stirrer, ultrasonic disperser, and microfluidic homogenizer.

  In the following, the details of the experimental procedure used to create the sample described above will be described.

Overview of Methods and Materials Tetrahydrofuran (THF) was dried by passing it through a column loaded with alumina under nitrogen (AB Pangborn et al., Organometallics 15, 1996, p. 1518) prior to use. The molecular weight was obtained by performing two steps of gel permeation chromatography / light scattering (GPC / LS) at 60 ° C. in a SSI pump equipped with a Wyatt DAWN EOS light scattering detector and a Wyatt Optilab DSP. Separation was achieved with Phenomenex 5 μm columns at 10 ⁵ , 10 ⁴ and 10 ³ angstroms using 0.1 M LiBr DMF as the solvent solution and a polypeptide concentration of about 5 mg / ml. Infrared spectra were recorded on a Perkin Elmer RX1 Fourier Transform Infrared Spectroscopy (FTIR) spectrophotometer calibrated using polystyrene films. Hydrogen nuclear magnetic resonance (1H-NMR) spectra were recorded on a Bruker AVANCE 400 MHz spectrometer. Deionized (DI) water was purified using a Purelab Option 560 reverse osmosis water purifier. Millipore water was obtained from a Milli-Q Biocel A10 purification device from Millipore. Silicone oil (poly- (dimethylsiloxane) or PDMS) was supplied by Gelest Inc. with viscosities ranging from 1 cSt to 1000 cSt (corresponding to different average molecular weights of PDMS).

Overview of Block Copolypeptide Synthesis α-amino acid-N-carboxylic anhydride NCA monomers were synthesized by published literature methods (HR Kricheldorf, α-Aminoacid-N-Carboxyanhydrides and Related Materials (Springer-Verlag, NY), 1987). All block copolypeptides were polymerized using (PMe ₃ ) ₄ Co initiator (HF Klein and HH Karsch, Chem. Ber. 108, 1975, p. 944). The resulting polypeptide was characterized by GPC, ¹ H-NMR, and infrared spectrum (TJ Deming, Macromolecules 32, 1999, p. 4500). The composition of the copolymer was measured by analyzing the integrated value of ¹ H-NMR recorded in heavy water (D ₂ O). All compositions were within 5% of expected values. From the measured polymer chain length distribution, the polydispersity index (Mw / Mn) ranged from 1.1 to 1.3.

Poly _(N ε CBZ-L- _lysine) 40-b-poly (rac- _{leucine) 20}
In a dry box, L-lysine NCA (10.00 g, 33 mM) was dissolved in THF (200 ml) and placed in a 500 ml flat bottom flask that could be sealed with a plastic stopper. Next, an amount of (PMe ₃ ) ₄ Co (16 ml of a 48 mg / ml solution in THF) was added to the flask with a syringe. A stir bar was added to seal the flask and stirred for 45 minutes. A certain amount (50 μl) was taken out from the polymer for GPC analysis (Mn = 11000, Mw / Mn = 1.24). L-leucine NCA (1.3 g, 8.2 mM) and D-leucine NCA (1.3 g, 8.2 mM) were dissolved in THF (52 ml) and subsequently added to the polymerization mixture. After stirring for 16 hours, the solution was removed from the dry box and THF was removed under reduced pressure. FTIR analysis showed complete consumption of monomers and was similar to known results (V. Breedveld et al., Macromolecules 37, 2004, p.3943).

Poly (L-lysine · HBr) ₄₀ -b-poly (rac-leucine) ₂₀ , K ₄₀ rL ₁₀
The above poly _(N ε CBZ-L- _lysine) 40-b-poly (rac- _{leucine) 20,} was dissolved in trifluoroacetic acid (TFA) (350 ml), in an ice bath and transferred to a flat bottom 1 liter flask placed. Next, HBr (33% in acetic acid) was added (40 ml, 131 mM) and allowed to react for 2 hours with stirring. Diethyl ether was added to the reaction mixture and centrifuged to isolate the deprotected polymer. Subsequently, the isolated polymer was dissolved in DI water, tetrasodium EDTA (3 mM, 4 days), 0.1 M HCl (2 days), DI water (1 day), 0.1 M LiBr (2 days). ), DI water (2 days), dialyzed (6000-8000 MWCO membrane), changing each solution three times a day. The dialyzed polymer was isolated by lyophilization to give a white powder (4.8 g, 70.2%) as a product. FTIR and ¹ H-NMR were performed and the results were similar to those known (V. Breedveld et al., Macromolecules 37, 2004, p.3943).

FITC functionalized K ₄₀ rL ₁₀
K ₄₀ rL ₁₀ was generated as described above. GPC analysis of the first fragment (polyCBZ-lysine) was Mn = 10500, Mw / Mn = 1.20. The deprotected copolymer (150 mg, 1.3 × 10 ⁻² mM) was dissolved in water and placed in a 125 ml flat bottom flask. NaHCO ₃ (162 mg, 19 mM) was added to the solution. Fluorescein isothiocyanate (FITC) (5 mg, 1.3 × 10 ⁻² mM) was dissolved in dry DMSO solution (1 ml) and added to the polymer solution. A stir bar was added and the reaction mixture was stirred overnight. The polymer solution was dialyzed (6000-8000 MWCO membrane) with DI water for 3 days, changing the water 3 times a day. The dialyzed polymer was isolated by lyophilization to give a yellow-orange polymer (130 mg, 87%) containing approximately 1 unit of fluorescein per polymer chain.

Emulsification of silicone oil using K ₄₀ rL ₁₀ Lyophilized K ₄₀ rL ₁₀ copolypeptide was first dissolved in deionized water at the desired concentration. The range of concentration C of the block copolypeptide was 1.0 × 10 ⁻⁴ mM to 1.7 mM. Silicone oil (10 cSt, Gelest PDMS) was added to achieve an oil volume fraction φ (0.01 ≦ φ ≦ 0.8) for the desired continuous phase. Different concentrations of silicone oil and water (10 cStPDMS silicone oil 0.793 g / ml vs. water 1.0 g / ml) resulted in plugs formed at the top of the tube (droplet size> 300 nm with Cyro-ETM). Pre-mix by applying shear using either a hand-held homogenizer (IKA Ultra-Turrax T8 with S8N-8G dispersive element) or a hand-held ultrasonic homogenizer (Cole-Palmer 4710 series model ASI at 35% to 40% output) An emulsion was produced. This premixed emulsion was passed through an M-110S Microfluidizer (r) Processor having a 75 μm stainless steel / ceramic interaction chamber and set to an input air pressure p = 130 psi. The emulsion was collected at the output of the microfluidic homogenizer and passed through the microfluidic homogenizer 5 more times (total N = 6) to reduce the average droplet radius <a> and increase the monodispersity of the sample. Double emulsions of various oils were formed other than 10 cSt and 100 cSt silicone oils including copolypeptide, water, and soybean oil and methyl oleate. The formation of a double emulsion with the following copolypeptide composition was confirmed by Cyro-CTEM. _{K 20 rL 10, K 40 rL} 5, K 40 rL 10, K 40 rL 20, K 40 rL 30, K 40 rL 20, and _E 40 _rL 10 _(E = glutamic acid).

Emulsion fractionation A 1.5 mM K ₄₀ rL ₂₀ emulsion (produced as described above) was placed in a 15 ml plastic centrifuge tube and centrifuged at 3500 rpm for 24 hours using an IEC HN-S tabletop centrifuge. separated. A 0.5 mm plug was formed and separated from the remainder. Different concentrations of silicone oil and water (0.9 c g / ml of 10 cStPDMS silicone oil vs. 1.0 g / ml water) resulted in plugs at the top of the tube (droplet particle size> 300 nm with Cyro-ETM). The stopper was separated from other samples as the main residue, and these primary residues were further fractionated using a Beckman L8-55 ultra high speed centrifuge for 4 hours at 20,000 rpm. A plug (Cyro-TEM, droplet size range 30 nm to 200 nm) was formed at the top of the suspension, along with a secondary residue that remained floating (Cyro-TEM, droplet size range 10 nm to 30 nm).

Dynamic light scattering (DLS)
The diameter of the emulsion droplets was measured by dynamic light scattering using a Photocor-FC substrate and software. Samples as to read the strength is in the range of 1x10 ⁵ to 6x10 ^5, and diluted. Each measurement was performed for 500 seconds at a scattering angle of 90 ° using a linear channel spacing and an adjustable baseline. The fitting method used is a cumulant analysis with a baseline that can be adjusted to fit the data and calculate the mean droplet radius.

Mounting three fluorescent probes on different compositions of K ₄₀ rL ₁₀ emulsion To label hydrophobic liquid, pyrene was dissolved in a silicone oil component at a concentration of 0.01M and quantum dots (Evident Technologies, Type T2 -MP 650 nm Macoun Red InGaP / ZnS, amine functionalized) was dispersed in water at a concentration of 2 μM. FITC-K ₄₀ rL ₁₀ (150 μl of 0.1 mM solution) was mixed with InGaP quantum dots (50 μl of 8 μM solution) and pyrene in 10 cSt silicone oil (50 μl of 0.01 M pyrene solution) for emulsion formation. The mixture was emulsified using an ultrasonic homogenizer (at 35% power) for 10 seconds.

Laser confocal scanning microscopy (LSCM)
0.1 mM FITC-K ₄₀ rL ₁₀ emulsion (φ = 0.2, ₁₀ cSt silicone oil) was mixed with 800 μl of 0.1 mM FITC-K ₄₀ rL ₁₀ polypeptide solution and 200 μl of ₁₀ cSt PDMS silicone oil, followed by The mixture was emulsified for 10 seconds using a hand-held ultrasonic homogenizer (at 35% output). Prior to imaging, an aliquot of 0.1 mM FITC-K ₄₀ rL ₁₀ emulsion suspension was diluted 10-fold with deionized (DI) water. A drop of emulsion was placed on a glass slide, followed by a cover glass. Samples were 488 nm (blue) argon laser (JDS Uniphase), 561 nm (green) diode laser (DPSS: Melles Griot), and Spectra-Physics Millenia X 532 nm (green) diode pump laser and Tsunami Ti (to 768 nm for UV excitation) Images were taken using a Leica-SP MP confocal multiphoton inverted microscope equipped with a two-photon laser setup consisting of a tuned sapphire picosecond pulsed infrared laser.

Fluorescence microscopy Prior to fluorescence imaging, the emulsion suspension was diluted 10-fold with DI water. One drop of the emulsion was placed on a glass slide and covered with a cover glass. Samples were imaged using a Zeiss 200 fluorescence microscope.

Cryogenic Transmission Electron Microscopy (Cyro-TEM) Imaging Each emulsion sample was diluted 10-fold with DI water before imaging. Next, a certain amount (5 μl) of each sample was placed on a carbon grid. The carbon grid was mounted on a Vitrobot (FEI) automatic vitrification device for automatic blotting and vitrification of samples in liquid esant. The grid was stored under liquid nitrogen and then placed in a Phillips Tecnai F20 electron microscope with an acceleration voltage of 120 kV using a cold stage. Images were acquired with a Teitz SCX slow scan CCD detector in conjunction with the Legion software package.

Additional Examples Block copolypeptide surfactants designed in some embodiments of the present invention have the general structure of poly (L-lysine · HBr) _x -b-poly (rac-leucine) _y , K _x rL _y. Have. Here, x is in the range of 20 to 100, and y is in the range of 5 to 30 (FIG. 1A). Hydrophilic poly (L-lysine / HBr) fragments are highly charged at neutral pH and have good water solubility (E. Katchalski and M. SeIa, Synthesis and chemical properties of poly-alpha-amino acids Advances in Protein Chemistry 13, 1958, p.243-492), with abundant amine groups for chemical functionalization (P. Niederhafner, J. Sebestik, and J. Jezek, Peptide dendrimers. Journal of Peptide Science 11, 2005, p.757-788). Unlike the hydrophobic fragments of other polymeric amphiphiles, the poly (L-leucine) fragment adopts a rod-like α-helix conformation, which results in strong interchain association and common organic solvents. (AP Nowak et al., Rapidly recovering hydrogel scaffolds from self-assembling diblock copolypeptide amphiphiles. Nature 417, 2002, p. 424-428). Block copolymers with a structure of K _x L _y (eg, K ₆₀ L ₂₀ ) have been shown to associate strongly in water and form a membrane through the assembly of hydrophobic fragments (EP Holowka, DJ Pochan And TJ Deming, Charged polypeptide vesicles with controllable diameter, Journal of the American Chemical Society 127, 2005, p. 12423-12428). Thus, the nature of the peptide allows additional mechanical stability of the droplet interface via interchain hydrogen bonding in the oil layer (C. Lapp, and J. Marchal, Preparation De La Poly-D, L- Phenylalanine En Helice Par Polymerisation De La D, L-Benzyl-4 Oxazolidine Dione-2-5, Journal De Chimie Physique Et De Physico-Chimie Biologique 60, 1963, p.756-766) Improved solubility (Table 1) (HR Kricheldorf and T. Mang, C-13-NMR Sequence-Analysis, 20. Stereospecificity of the Polymerization of D, L-Leu-NCA and D _, L-VaI-NCA. Makromolekulare Chemie-Macromolecular Chemistry and Physics 182, 1981, p. 3077-3098, JW Breitenbach, K. Allinger, and A. Koref, Viskositatsstudien an Losungen von DL-Phenylalanin-Polypeptiden.Monatsh. Chem. 86, 1955, p. .269), focusing on poly (rac-leucine) to promote surface activity (Table 1).

The emulsifying activity of the diblock copolypeptide was observed by adding PDMS silicone oil to an aqueous solution of K _x (rac-L) _y (Table 1, FIG. 2A, FIG. 2B, FIG. 11A). The mixture was sheared using a hand-held rotary homogenizer and then passed through a high pressure microfluidic homogenizer 6 times (FIG. 2C). All K _x (rac-L) _y samples were stable and water-in-oil-in-water nanoemulsions without ripening or phase separation for 9 months. Only in copolypeptides with a low content of hydrophobic components (eg, K ₄₀ (rac-L) ₅ ), the emulsion gradually phase separated after one year. Other mixing methods, including ultrasonic mixing, also resulted in stable emulsions, but the droplet diameters were up to several micrometers. The use of hydrophobic fragments of 30 residues or more significantly reduced solubility and water solubility to 1 mM with K ₄₀ (rac-L) ₃₀ (Table 1). As a control, K ₆₀ L ₂₀ and 0.1 mM suspensions of K ₆₀ were used as surfactants, respectively, but K ₆₀ L ₂₀ formed a stable emulsion, while K ₆₀ produced a mixture of oil and water. Emulsification was not possible (FIGS. 9A and 9B). These results indicate that the K _x (rac-L) _y surfactant results in a stable emulsion over a wide range of compositions and concentrations.

To investigate the droplet structure, an emulsion stabilized with a block copolypeptide was imaged using an optical microscope and a cryogenic transmission electron microscope (CTEM). All K _x (rac-L) _y samples were found to contain oil droplets, each containing primarily one inner aqueous droplet in a fixed ratio of inner volume to outer volume (from FIG. 7A). FIG. 7D). Contrasting these results, the emulsion formed using K ₆₀ L ₂₀ contained only simple oil droplets, so that it was possible to stabilize the double emulsion structure according to the embodiment of the present invention. It has become clear that plays an important role. The droplet size increased with decreasing hydrophobic copolypeptide content (Table 1, FIG. 10C), suggesting that the composition of the copolymer affects the interfacial mean curvature. It was also found that the average droplet diameter increased with decreasing concentration of K ₄₀ (rac-L) ₂₀ (FIG. 10A). Similarly, a decrease in oil volume fraction resulted in smaller emulsion droplets (FIG. 10B). Emulsions were always formed without reversal, up to an oil volume fraction approaching 50%, with water held as a continuous liquid. In addition to PDMS, other immiscible liquids such as dodecane, soybean oil, and methyl oleate also resulted in emulsions using 1 mM aqueous K ₄₀ (rac-L) ₂₀ . Diversity in various embodiments of the present invention includes R ₄₀ (rac-L) ₁₀ or E ₄₀ (including guanidine or carboxylic acid functional groups of L-arginine (R) and L-glutamic acid (E), respectively. rac-L) ₁₀ was shown by the formation of a stable emulsion (FIG. 8A, FIG. 8B).

Many applications require the formation of nanoscale emulsion droplets, for example, drug delivery typically requires an outer droplet diameter of 200 nm or less, preferably 50 to 100 nm (K. Kataoka, GS Kwon, M. Yokoyama, T. Okano, and Y. Sakurai, Block-Copolymer Micelles as Vehicles for Drug Delivery. Journal of Controlled Release 24, 1993, p. 119-132). There are many conventional methods for generating double emulsions, but none of them enable the generation of droplets in this size range (N. Garti, Double emulsions-Scope, limitations and new achievements. Colloids and Surfaces A -Physicochemical and Engineering Aspects 123, 1997, p.233-246, IG Loscertales et al., Micro / nano encapsulation via electrified coaxial liquid jets.Science 295, 2002, p.1695-1698, AS Utada et al., Monospersperse double emulsions generated from a microcapillary device.Science 308, 2005, p.537-541, A. Benichou, A. Aserin, N. Garti, Double emulsions stabilized with hybrids of natural polymers for entrapment and slow release of active matters.Advances in Colloid and Interface Science 108-109, 2004, p.29-41). Using an ultrasonic homogenizer, a K ₄₀ (rac-L) ₂₀ emulsion was created in which the smallest double emulsion droplets were observed with a CTEM, resulting in a polydisperse sample with a diameter of about 400 nm. These droplets were further reduced in particle size by six passes through the microfluidic homogenizer, resulting in droplet diameters ranging from about 10 to several hundred nm. The stability of both these double emulsions against both external and internal coalescence enabled the separation of droplets in the desired size range by centrifugation. Centrifugation of the sample of FIG. 12A resulted in buoyancy fractionation including droplets with diameters of several hundred nm. The smaller droplets in the remaining suspension are further separated by ultra high speed centrifugation (TG Mason, JN Wilking, K. Meleson, CB Chang, and SM Graves, Nanoemulsions: formation, structure, and physical properties. Journal. of Physics-Condensed Matter 18, 2006, p.R635-R666), resulting in fractionation of droplets ranging in diameter from about 10 nm to 100 nm (FIG. 12C). This fractionation process is extremely feasible for the isolation of stable double emulsion droplets in the nanoscale range, and the droplets are surprisingly stable against external stresses such as shear stress, elongation stress, and osmotic compression stress. It shows that.

To demonstrate their encapsulation ability, both water-soluble and oil-soluble fluorescent markers were mounted in a double emulsion stabilized with a copolypeptide. The dispersion of InGaP / ZnS quantum dots was mixed with FITC-K ₄₀ (rac-L) ₁₀ labeled with fluorescein prior to emulsification with PDMS silicone oil containing pyrene. A fluorescence microscope was used to image the polypeptide labeled with both markers in the double emulsion droplets (FIG. 5B). Image shows compartmentalization with hydrophilic quantum dots (red) in the inner aqueous phase, hydrophobic pyrene (blue) in the oil phase, and labeled polypeptide (green) stabilizing the outer interface. It was. No polypeptide at the inner interface was observed, probably due to the disappearance of the fluorescein label by the quantum dots. In samples made with K ₆₀ L ₂₀ surfactant, only simple oil droplets without an inner aqueous compartment were observed (FIG. 13B). It has been observed that these loads have been encapsulated in droplets for at least 3 months, indicating an unprecedented improvement in the stability of the inner aqueous compartment compared to most double emulsion systems. (SS Davis and IM Walker, Multiple Emulsions as Targetable Delivery Systems. Methods in Enzymology 149, 1987, p. 51-64, N. Garti, Double emulsions-Scope, limitations and new achievements. Colloids and Surfaces A-Physicochemical and Engineering Aspects 123, 1997, p.233-246, A. Benichou, A. Aserin, N. Garti, Double emulsions stabilized with hybrids of natural polymers for entrapment and slow release of active matters.Advances in Colloid and Interface Science 108- 109, 2004, p.29-41).

These surfactants have a hydrophobic content (HC) that improves the stability of oil / water emulsions with oil on the concave side of the curved interface of nanoscale droplets, ie the ratio of hydrophilic to hydrophobic residues It is designed high. Conversely, the water-oil interface inside the water / oil / water double emulsion is most stabilized by the low HC surfactant since the oil is on the convex side of the interface. The average interfacial curvature of these different signs (R. Strey, Microemulsion microstructure and interfacial curvature. Colloid and Polymer Science 272, 1994, p. 1005-1019) is the reason why a surfactant of one composition is generally a double emulsion. Describes whether the droplets do not stabilize and therefore a combination of surfactants is required (MF Ficheux, L. Bonakdar, F. Leal-Calderon, and J. Bibette, Some stability criteria for double emulsions Langmuir 14, 1998, p.2702-2706). It also explains that rod-like oligoleucine fragments are not solvated with oil and tend to aggregate in the oil phase, and K ₆₀ L ₂₀ only forms an oil / water emulsion (AP Nowak et al., Rapidly recovering hydrogel scaffolds from self-assembling diblock copolypeptide amphiphiles, Nature 417, 2002, p.424-428). Based on these observations, the stabilization of the inner aqueous droplets of the water / oil / water double emulsion is such that the hydrophobic polypeptide fragments are easily dispersed in the oil and the three-dimensional structure of the large hydrophilic fragments in the aqueous phase. This is likely to be noticeable when crowds are avoided.

The racemic-leucine fragment in K _x (rac-L) _y provides a combination of features that stabilize double emulsion droplets. The conformational flexibility of these fragments improves oil solubility. This is indicated by the fact that poly (rac-leucine) is dissolved in organic solvents such as CH ₂ Cl ₂ and (CH ₃ ) ₂ SO and poly (L-leucine) is not (HR Kricheldorf, and T. Mang, C-13-NMR Sequence-Analysis, 20. Stereospecificity of the Polymerization of D, L-Leu-NCA and D _, L-VaI- NCA Makromolekulare Chemie-Macromolecular Chemistry and Physics 182, 1981, p. 3077-3098, JW Breitenbach, K. Allinger, and A. Koref, Viskositatsstudien an Losungen von DL-Phenylalanin-Polypeptiden, Monatsh. Chem. 86, 1955, p.269). Thereby, since the hydrophobic fragment can be more easily dispersed in the oil, the K _x (rac-L) _y chain can further stabilize the oil-water interface of the inner droplet. Despite improved solubility, almost all poly (rac-leucine) residues are involved in intramolecular and intermolecular hydrogen bonding in oil solvents. Studies on racemic polymers of both leucine and phenylalanine have demonstrated that both are associated with organic solvents via hydrogen bonds (C. Lapp and J. Marchal, Preparation De La PoIy-D _, L -Phenylalanine En Helice Par Polymerisation De La D, L-Benzyl-4 Oxazolidine Dione-2-5, Journal De Chimie Physique Et De Physico-Chimie Biologique 60, 1963, p. 756-766). At the interface of the inner aqueous droplet with the oil, the high HC inventive polymer provides a low collective concentration of rac-leucine fragments in the oil phase, which results in a weak and stable interface with little interchain hydrogen bonding (FIG. 2C). However, the curvature of the opposite sign at the oil-water interface of the outer droplet can concentrate the rac-leucine fragments in the oil phase and promote interchain hydrogen bonding. Thus, while the inner aqueous droplets are more unstable, the outer interface is expected to be strengthened by hydrogen cross-linking, thus avoiding merging with the outer droplets and forming a simple emulsion. To test this concept, an emulsion was made containing a silicone oil capped with an acetamide group capable of hydrogen bonding to the rac-leucine fragment. Emulsification of K ₆₀ (rac-L) _{20 produced} a water / oil / water nanoemulsion with multiple inner droplets (FIGS. 11A to 11D), and the rac-leucine fragment was hydrogen bonded in the oil phase. It supports the hypothesis that droplets can be stabilized via interaction and thus inhibit the coalescence of inner droplets.

  The use of the racemic disordered hydrophobic polypeptide fragments of the present invention that interact through hydrogen bonding is a novel means of stabilizing water / oil / water double emulsions. This method differs greatly from protein or peptide stabilized emulsions where a double emulsion is not formed without additional surfactant and an ordered amphipathic helix is the most common source of surfactant. (MM Enser, GB Bloomberg, C Brock, and DC Clark, De novo design and structure-activity relationships of peptide emulsifiers and foaming agents. International Journal of Biological Macromolecules 12, 1990, p. 118-124, E. Dickinson, Structure. and composition of adsorbed protein layers and the relationship to emulsion stability.Journal of the Chemical Society Faraday Transactions 88, 1992, p.2973-2983, M. Saito, M. Ogasawara, K. Chikuni, and M. Shimizu, Synthesis of a peptide emulsifier with an amphiphilic structure.Bioscience, Biotechnology and Biochemistry 59, 1995, p.388-392, DG Dalgleish, Conformations and structures of milk proteins adsorbed to oil-water interfaces, Food Research International 29, 1996, p.541-547, CB Chang, CM Knobler, WM Gelbart, and TG Mason, Curvature Dependence of Viral Protein Structures on Encapsidated Nanoemulsion Droplets, ACS Nano 2, 2008 , P.281-286). The strategy of the present invention has also been applied to other copolypeptides as it resulted in stable double nanoemulsions in samples containing hydrophobic fragments of rac-valine and rac-alanine (FIGS. 8C, 8D). The use of block copolypeptide surfactants can overcome the major limitations of water / oil / water double emulsions by making it easier than ever to generate nanoscale droplets, and its The droplets are highly stable and can encapsulate both oil-soluble and water-soluble loads simultaneously. (The term "load" here includes within any droplet, whether the droplet is a double emulsion inner droplet, an outer droplet, or a direct emulsion simple droplet. Means any substance that can be added to the liquid.)

Method Summary K ₄₀ (rac-L) ₂₀ copolypeptides are dissolved in ultrapure water at the desired concentration (eg, 0.01 mM <C <1.5 mM). PDMS silicone oil (10 cSt) is added to achieve the desired oil to continuous phase volume fraction φ (0.05 <φ <0.50). Mix using hand-held homogenizer (IKA Ultra-Turrax T8 with S8N-8G dispersive element) for 1 minute or hand-held ultrasonic homogenizer (Cole-Palmer 4710 series model ASI at 35-40% output) for 10 seconds And make a microscale emulsion (ie, a “premixed” emulsion). The emulsion is passed through a Microfluidizer (r) Processor M-110S equipped with a 75 μm stainless steel / ceramic interaction chamber and set to an input air pressure p = 130 psi. The emulsion is collected at the output of the apparatus and then passed through the microfluidic homogenizer a total of 6 times. This reduces the average droplet radius <a> (eg, single droplets of simple emulsions and inner and outer droplets of double emulsions) and increases the monodispersity of the droplets within the emulsion. A similar procedure was used for the generation of emulsions with other block copolypeptide surfactants (Table 1, FIGS. 7A-7C). The ratio obtained by dividing the radius of the inner droplet by the radius of the outer droplet (referred to as the “I / O ratio”) was relatively uniform at different hydrophobic chain lengths, about 0.5 (Table 1, FIG. 7D). Other amphiphilic block copolypeptides in which the lysine or leucine regions were replaced with different hydrophilic or hydrophobic residues, respectively, were found to form double emulsions (FIGS. 8A-8D). In contrast to homopolypeptide K ₆₀ (FIG. 9A, FIG. 9B) which does not result in a stable emulsion or a stable double emulsion, the emulsifying ability of different copolypeptide surfactants is used to form a less stable emulsion. Qualitatively.

Method Supplement Materials Tetrahydrofuran (THF) was dried by passing it through a column loaded with alumina under nitrogen (AP Nowak et al., Rapidly recovering hydrogel scaffolds from self-assembling diblock copolypeptide amphiphiles. Nature 417, 2002). P.424-428). The molecular weight was obtained by performing two steps of gel permeation chromatography / light scattering (GPC / LS) at 60 ° C. in a SSI pump equipped with a Wyatt DAWN EOS light scattering detector and a Wyatt Optilab DSP. Separation was achieved with Phenomenex 5 μm columns at 10 ⁵ , 10 ⁴ and 10 ³ angstroms using 0.1 M LiBr DMF as the solvent solution and a polypeptide concentration of about 5 mg / ml. Infrared spectra were recorded on a Perkin Elmer RX1 Fourier Transform Infrared Spectroscopy (FTIR) spectrophotometer calibrated using polystyrene films. Hydrogen nuclear magnetic resonance ( ¹ H-NMR) spectra were recorded on a Bruker AVANCE 400 MHz spectrometer. Deionized (DI) water was purified using a Purelab Option 560 reverse osmosis water purifier. Ultrapure water (18 MΩ) was obtained from a Milli-Q Biocel A10 purification device from Millipore. Silicone oil (10 cSt, polydimethylsiloxane, PDMS) was supplied by Gelest Inc.

Block Copolypeptide Synthesis An α-amino acid-N-carboxylic acid anhydride NCA monomer was synthesized by the method of a published literature (the same literature). The resulting polypeptide was characterized using GPC, ¹ H-NMR, and infrared spectra (Id.). The composition of the copolymer was measured by analyzing the integrated value of ¹ H-NMR recorded in heavy water (D ₂ O). All compositions were within 5% of expected values. From the measured polymer chain length distribution, the polydispersity index (Mw / Mn) was in the range of 1.1 to 1.3. K60L20 was synthesized by published literature methods (EP Holowka, DJ Pochan, and TJ Deming, Charged polypeptide vesicles with controllable diameter. Journal of the American Chemical Society 127, 2005, p. 12423-12428). The chain conformation of the hydrophobic poly (leucine) fragment was confirmed using circular dichroism spectroscopy (FIG. 14). Here, the influence from the poly (lysine) fragment is described in (Poly (lysine), Rapidly recovering hydrogel scaffolds from self-assembling diblock copolypeptide amphiphiles. Nature 417, 2002, p.424-428). Racemic-lysine) fragments have been removed.

Poly _(N ε -CBZ-L- _lysine) 40-b-poly (rac- _{leucine) 20}
In a glove box filled with nitrogen, CBZ-L-lysine NCA (10 g, 33 mM) was dissolved in THF (200 ml) and placed in a 500 ml flat bottom flask that could be sealed with a plastic stopper. Next, an amount of (PMe ₃ ) ₄ Co (16 ml of a 48 mg / ml solution in THF) was added to the flask with a syringe. A stir bar was added to seal the flask and stirred for 45 minutes. A certain amount (50 μl) was taken out from the polymerization solution for GPC analysis (Mn = 11000, Mw / Mn = 1.24). L-leucine NCA (1.3 g, 8.2 mM) and D-leucine NCA (1.3 g, 8.2 mM) were dissolved in THF (50 ml) and subsequently added to the polymerization mixture. After stirring for 16 hours, FTIR analysis showed complete consumption of the monomer, similar to known results (Id.).

Poly (L-lysine / HBr) ₄₀ -b-poly (rac-leucine) ₂₀ , K ₄₀ (rac-L) ₂₀
The above poly _(N ε -CBZ-L- _lysine) 40-b-poly (rac- _{leucine) 20} solution removed from the dry box, the THF was removed under reduced pressure. The block copolypeptide was then dissolved in trifluoroacetic acid (TFA) (350 ml), transferred to a 1 liter flat bottom flask and placed in an ice bath. Next, HBr (33% in acetic acid) was added (40 ml, 131 mM) and allowed to react for 2 hours with stirring. Diethyl ether was added to the reaction mixture (400 ml) and centrifuged to isolate the deprotected polymer. Subsequently, the isolated polymer was dissolved in DI water, tetrasodium EDTA aqueous solution (3 mM, 2 days), HCl aqueous solution (100 mM, 2 days), DI water (1 day), LiBr aqueous solution (100 mM, 2 days). Finally, it was dialyzed (using a 6000-8000 MWCO membrane) in a 4-liter container with DI water (2 days), changing each solution 3 times a day. The dialyzed polymer was isolated by lyophilization to give a white powder (4.8 g, 70%) as a product. The block copolypeptide was subjected to FTIR and ¹ H-NMR, and the results were similar to the known ones (ibid.).

FITC functionalized K ₄₀ (rac-L) ₁₀
K ₄₀ (rac-L) ₁₀ copolymer was produced in the same manner as K ₄₀ (rac-L) ₂₀ . In the GPC analysis of the first fragment (polyCBZ-L-lysine), Mn = 10500 and Mw / Mn = 1.20. The deprotected copolymer (150 mg, 1.3 × 10 ⁻² mM) was dissolved in water and placed in a 125 ml flat bottom flask. NaHCO ₃ (160 mg, 19 mM) was added to the solution. A dry DMSO solution (1 ml) in which fluorescein isothiocyanate (FITC) (5 mg, 1.3 × 10 ⁻² mM) was dissolved was added to the polymer solution. A stir bar was added and the reaction mixture was stirred overnight. The polymer solution was dialyzed (using a 6000-8000 MWCO membrane) with DI water for 3 days and changing the water 3 times a day. The dialyzed polymer was isolated by lyophilization to give a yellow-orange polymer (130 mg, 87%) containing approximately 1 unit of fluorescein per polymer chain. A FITC functionalized K ₆₀ L ₂₀ copolymer was also prepared using a similar procedure.

Mounting fluorescent probes on different phases of FITC-K ₄₀ (rac-L) _10- stabilized double emulsion To label the hydrophobic phase, pyrene was dissolved in silicone oil at a concentration of 0.01M. To label the aqueous phase, water-soluble quantum dots (Evident Technologies, Type T2-MP 650 nm Macoun Red InGaP / ZnS, amine functionalized) were dispersed in the aqueous phase at a concentration of 2 μM. To make an emulsion, FITC-labeled K ₄₀ (rac-L) ₁₀ (150 μl of 0.1 mM solution) and InGaP quantum dots (50 μl of 8 μM solution) were added to pyrene (0. Mixed with 50 μl of 01 M pyrene solution). The mixture was emulsified using an ultrasonic homogenizer (at 35% power) for 10 seconds. The same procedure was used for FITC-K ₆₀ L ₂₀ block copolypeptide surfactant. Prior to imaging, unencapsulated quantum dots were removed by dialysis against deionized water.

  Although various embodiments of the present invention have been described in detail, it will be apparent from the foregoing description that changes and modifications can be made by those skilled in the art without departing from the broad scope of the invention. The invention is intended to embrace all such alterations and modifications that fall within the spirit of the invention as defined by the claims.

  For example, you may want to make a water / oil / water double emulsion with a higher oil volume fraction φ. Double emulsions are simple and appropriate through emulsification in the range of φ << 1 to 0.4 in the volume fraction of dilution of the primary dispersed phase of the outer droplets, and in some embodiments By simply changing the procedure, it is possible to form a very ordinary film up to about φ≈0.6. In particular embodiments extending this known form, it is believed that φ> 6, that is, about φ≈0.9 can be achieved. After emulsification at a certain φ, a method involving droplet structure (including simple single and double droplets) followed by evaporation, dialysis, centrifugation, ultrafast centrifugation, filtration, and microfluidic concentration By applying the osmotic pressure by, it can be concentrated to a higher φ. The maximum volume fraction at which an emulsion can be concentrated and made stable depends on many factors, including droplet size and how the copolymer stabilizes the elastic interface. In certain embodiments, enrichment up to φ≈0.95 can be achieved. For nanoscale droplets, volume fractions of up to about φ≈0.8 are usually reached through concentration after emulsification.

  After the generation of the double emulsion, in embodiments of the present invention, to separate smaller droplets from larger droplets, particle size fractionation such as centrifugation, ultra-high speed centrifugation, depletion interaction by outer droplet size, etc. Can be used. Also, because the buoyancy of the droplet depends on its density, which is determined by the volume of both the inner and outer droplets, it can also be used to fractionate the inner droplet volume.

  The “boundary surface region” here includes the following. Those skilled in the art are said to have a “film” of the primary dispersed phase (ie, oil) between the secondary dispersed phase (ie, the inner droplets of water) and the continuous phase (ie, the aqueous solution). In a stable double emulsion, there is this separation pressure of the membrane, which can counter heat-driven stress, chemical-driven stress, and mild external agitation (eg, physical shear stress) and thus the membrane It is said to be “stable”. The stability of the membrane is equivalent to the resistance to coalescence of the two oil-water interfaces (according to the generally accepted idea) with an average curvature of opposite sign. Stability from coarsening due to coalescence of outer droplets is generally required to make a practical product that maintains stable storage. In this case, there is also at least a short-range repulsive force that creates a repulsive separation pressure of the continuous phase water film that separates the oil-water interface of two outer droplets that may be in close proximity.

  Also, according to additional embodiments of the present invention, other types of materials can be used as stabilizers or surface modifiers, which block copolymers that stabilize double or multiple emulsion interfaces. There is a possibility that it can be taken in. This potential copolymer includes lipo-polypeptides, glyco-polypeptides, and polynucleic acid-polypeptides (ie, polypeptide-polynucleotide copolymers). For example, a charged oligonucleotide or short polynucleotide (eg, single stranded DNA, double stranded DNA, RNA, etc.) replaces a hydrophilic block and attaches to a racemic hydrophobic block (eg, rac-L). Provides desired solubility and interfacial stability characteristics.

  In another embodiment, a block copolymer modified with polyethylene glycol (PEG) can be included, including the generation of a double emulsion and the modification of the surface of a stable double emulsion (added with PEGylated molecules) Poly- (ethylene glycol) -poly- (peptides) specified for use (even without creating significant interfacial stability). PEG and PEG derivatives are known to provide good resistance coatings for drug delivery vehicles, and it is expected that double emulsions modified with PEG will exist long in the circulation of the bloodstream.

  It can of course be expected that the release of loads such as drug molecules contained in double emulsions and double nanoemulsions can be triggered by changes in pH, ionic strength, temperature, chemical environment, or combinations thereof. Such changes can affect conformation, density, and interactions between copolypeptides present at the oil-water interface, altering stability and creating conditions suitable for release. Similarly, from the nature of the liquid, in the embodiment of the present invention, it can be expected that the double emulsion exhibits excellent clearance characteristics when introduced into a living body including a human. This clearance characteristic means a mechanism by which an organism can clear (i.e. digestion, excretion, or other removal methods) droplet material and associated stabilizing material.

  The following natural amino acids must be polymerized to be part of the molecular composition of the polymer that stabilizes the droplet structure including, but not limited to, single droplets, double droplets, and multiple droplets. Of course you can expect. This stabilization includes nanoscale and larger droplet structures. These amino acids come in various forms including, but not limited to, enantiomeric, enantiomeric, and other molecular specifications such as H-, L-, Z-, D-, LD-, and rac-. ing. Although the classification of “natural” is somewhat ambiguous, a good guide to “natural” amino acids can be deduced from a list of products from catalogs of major biochemical and chemical companies such as Sigma-Aldrich (r). For example, the catalog has a wide range of synthetic precursors for the following amino acids: alanine, arginine, aspartic acid, cysteine / cystine, glutamic acid, glutamine, glycine, histidine, isoleucine, leucine, lysine, methionine, There are phenylalanine, proline, serine, threonine, tryptophan, tyrosine, and valine.

  Many of the examples above demonstrate that the use of fully racemic amino acids in the hydrophobic block of a copolypeptide can promote the formation and stabilization of double emulsions, but the concepts of the present invention are limited to these examples. Not. For example, in embodiments of the present invention, non-racemic amino acids (ie, sub-sections of consecutive D-amino acids and / or sub-sections of consecutive L-amino acids in a hydrophobic block containing racemic properties) It is possible to design and synthesize copolypeptides that have hydrophobic blocks that contain a portion of) and that can provide the desired properties that promote the formation and stabilization of double emulsions. Similarly, while examples have shown that the use of non-racemic amino acids in the hydrophobic block of a copolypeptide tends to promote the formation and stability of a single emulsion, in embodiments of the present invention, It is possible to design and synthesize copolypeptides that have hydrophobic blocks that include amino acids in part and that can provide the desired properties that promote the formation and stabilization of a single emulsion.

  Other natural amino acid-related structures can be polymerized to form part of the molecular composition of the copolymer that stabilizes double emulsion and double nanoemulsion structures. It includes amino alcohols, amino aldehydes, amino lactones, and N-methyl amino acids.

  Examples of unnatural amino acids and amino acid derivatives that can be part of a copolymer that stabilizes single, double, and multiple emulsions include alanine derivatives, alicyclic amino acids, arginine derivatives, aromatic amino acids, asparagine derivatives, aspartic acid Derivative, β-amino acid, cysteine derivative, DAB (2,4-diaminobutanoic acid), DAP (diammonium phosphate), glutamic acid derivative, glutamine derivative, glycine derivative, histidine derivative, homoamino acid, isoleucine derivative, leucine derivative, wire Linear core amino acid, lysine derivative, n-methylamino acid, norleucine, norvaline, ornithine, penicillamine, phenylalanine derivative, phenylglycine derivative, proline derivative, pyroglutamine derivative, serine derivative, There are molecular compositions and structures of leonine derivatives, tryptophan derivatives, tyrosine derivatives, valine derivatives, and more than 100 “other” derivative types listed in the general catalog of biochemical and chemical companies. For example, more than 1000 unnatural amino acid derivatives are listed as products of Sigma-Aldrich (r) in August 2008. This number appears to be large, and they may provide alternative other molecular structures that can be incorporated into emulsions, double emulsions, and copolypeptides used to stabilize multiple emulsions. Another source of potential molecular components that can be used to produce complex amphiphilic copolymers suitable for the stabilization of single emulsions or double emulsions is the 2008 edition of “Building of BACHEM Americas Inc. A variety of amino acid derivatives, special amino acids, resin-bound amino acids, and other linkers and reagents are described in the "Blocks" and "Peptides and Biochemicals" catalogs (www.bachem.com).

  Copolymers that stabilize droplets are intercopolymer molecules on the same interface, between copolymer molecules on adjacent inner and outer interfaces in the same double or multiple emulsion structure, and the interface of adjacent inner droplets. Can be activated through chemical or physical changes that result in functional ties and / or linkages between the copolymer molecules above and between the copolymer molecules on the interface of adjacent outer droplets It can have a molecular composition and structure including reactive groups (eg, polymerizable groups, pH sensitive groups, photoreactive groups, and photopolymerizable groups).

  Copolymers that stabilize the droplet structure can have enzymatic and catalytic functions. This includes enzymes, analytical enzymes, cofactors, collagenases, enzyme inhibitors, enzyme-mediated synthesis, stabilizers, enzyme substrates, lectins, molecular biological enzymes, kinases, phosphatases, and proteolytic enzymes and substrates. Other desired functional molecular components of the copolymer can be selected and incorporated into the copolymer, such as amine protecting agents, guanidine protecting agents, and guanidinylation.

  Synthetic structures useful for polymerizing to form part of the molecular composition of the copolymer include, but are not limited to, single droplets, double droplets and multiple droplets, whether microscale or nanoscale droplets. Stabilize the droplet structure of the structure. These synthetic structures include, but are not limited to, poly- (ethylene glycol) (PEG), functionalized oligoethylene glycol, monofunctional PEG, homobifunctional PEG, heterobifunctional PEG, PEGylated oligonucleotide, And PEGylated peptides.

  In general, synthesis-inducing molecules that mimic at least some aspects of composition, structure, and function can of course be expected to provide double emulsion stabilization as described herein. Therefore, it can of course be expected that molecules such as new unnatural amino acids developed in the future can also be used to stabilize double and multiple emulsion structures.

* = Number average molecular weight measured by GPC-LS.
** = This sample is separated by centrifuging large droplets and then separated by ultra high speed centrifugation.
# = This sample forms a simple water-in-oil emulsion.
† = oil / water interfacial tension data, contact between 10 cSt PDMS and 10 mM sodium dodecyl sulfate (SDS) aqueous solution = 12.4 dyne / cm, contact between 10 cSt PDMS and deionized water = 40.7 dyne / cm.
N / A = no experiment.
A block copolypeptide surfactant was used to produce the emulsion. All emulsions were generated using a microfluidic homogenizer and conditions of number of passes N = 6, homogenizer input air pressure p = 130 psi, block copolypeptide concentration C = 1.0 mM, and oil volume fraction φ = 0.20. . The diameter (outer droplet) and inner / outer diameter ratio were obtained by averaging measurements of at least 50 droplets of the CTEM image. The critical aggregation concentration (CAC) was measured using pyrene fluorescence at 20 ° C. The water solubility limit was measured by diluting a 15 mM solution of each peptide to an optically clear solution. The solubility of the block copolymer was negligible in PDMS. The oil / water interfacial tension data was measured by the Du Nuoy ring method using 10 cSt PDMS and a block copolypeptide solution (0.1 mM, pulling rate = 0.01 mm / s, 25 ° C.).

Claims (35)

A substantially continuous liquid medium;
A plurality of droplet structures dispersed in the substantially continuous within the liquid medium, the a including emulsions,
Each droplet structure of the plurality of droplet structures is
An outer droplet of a first liquid having an outer surface;
An inner droplet of a second liquid having an inner surface within the first droplet, the second liquid being immiscible with the first liquid, the inner droplet and the outer liquid An inner droplet having a film of the first liquid in a boundary surface region between the droplets;
An outer layer of a block copolymer disposed on the outer surface of the outer droplet;
An inner layer of a block copolymer disposed on the inner surface of the inner droplet proximate to the boundary surface region between the inner droplet and the outer droplet;
The block copolymer jointly comprises a hydrophilic polymer block and a hydrophobic polymer block that act to stabilize the droplet structure ;
It said first liquid is Ri immiscible der to 該連 continued liquid medium,
The hydrophilic polymer block is a polypeptide block mainly containing hydrophilic amino acids, and the hydrophobic polymer block is a polypeptide block mainly containing hydrophobic amino acids;
Hydrophobic amino acids wherein the hydrophobic amino acid is racemic-alanine, racemic-glycine, racemic-isoleucine, racemic-leucine, racemic-methionine, racemic-phenylalanine, racemic-proline, racemic-tryptophan, racemic-valine and combinations thereof An emulsion selected from the group of The emulsion of claim 1 wherein the liquid largest diameter is less than or equal to 1 000Nm corresponding to the non-deformed droplet diameter of droplets structure is either One 1 0 nm or more. The liquid the maximum diameter is at 2 50 nm or less corresponding to the undeformed droplet diameter of droplets structure, or One 5 emulsion according to claim 1 0 nm or more.   The emulsion according to claim 1, wherein the block copolymer of the inner layer of the block copolymer has substantially the same molecular form as the block copolymer of the outer layer of the block copolymer. The hydrophilic polymer block is 2 00Da or et 3, having a molecular weight in the range of 000,000Da, the hydrophobic polymer block is 2 00Da or et 3, to claim 1 having a molecular weight in the range of 000,000Da The emulsion as described. The dimensionless ratio defined by dividing the average radius of the inner droplet by the average radius of the outer droplet is 0 . 9 below, One or 0. The emulsion according to claim 1, which is 05 or more. The inner layer of the block copolymer is a diblock copolymer layer formed from the polymerization of two distinct types of monomers, and the outer layer of the block copolymer is the two distinct types of the different types. The emulsion of claim 1 which is a layer of a diblock copolymer formed from polymerization of a monomer. The emulsion according to claim 1, wherein the hydrophilic polymer block is a polypeptide block containing a plurality of hydrophilic amino acids, and the hydrophobic polymer block is a polypeptide block containing a plurality of hydrophobic amino acids. The hydrophilic amino acid is L-arginine, L-asparagine, L-aspartic acid, L-cysteine, L-glutamic acid, L-glutamine, L-histidine, L-lysine, L-serine, L-threonine, L-tyrosine. , D-arginine, D-asparagine, D-aspartic acid, D-cysteine, D-glutamic acid, D-glutamine, D-histidine, D-lysine, D-serine, D-threonine, D-tyrosine, DL-arginine, A hydrophilic amino acid consisting of DL-asparagine, DL-aspartic acid, DL-cysteine, DL-glutamic acid, DL-glutamine, DL-histidine, DL-lysine, DL-serine, DL-threonine, DL-tyrosine and combinations thereof The emulsion according to claim 1 selected from the group. The hydrophilic amino acid and the hydrophobic amino acid are alanine, arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, The emulsion of claim 1 selected from the group of amino acids consisting of valine and combinations thereof. The emulsion according to claim 1, wherein the hydrophilic amino acid is L-lysine and the hydrophobic amino acid is racemic-leucine. When K is L-lysine, rL is racemic-leucine, x is an integer in the range of 10 to 200, and y is an integer in the range of 3 to 30, the block copolymer satisfies the formula of KxrLy The emulsion according to claim 1, wherein the emulsion is a block copolypeptide having the following structure. The second liquid of the inner droplet is hydrophilic and further includes single-stranded DNA, double-stranded DNA, RNA, oligonucleotide, peptide, protein, salt, virus, vitamin, serum, lysate , ATP, GTP, molecular motor, hydrophilic drug molecule, cell, vesicle, nanodroplet, nanoparticle, fullerene, single-walled carbon nanotube, multi-walled carbon nanotube, cytoplasm, ribosome, enzyme, glucose, hemoglobin, Golgi, dendrimer, Surfactant, lipid, albumin, anion, cation, buffer, saccharide, saccharide, quantum dot, clay nanoparticle, metal nanocluster, metal nanoparticle, magnetically sensitive iron oxide nanoparticle, organic nanosphere, organic nanoparticle, inorganic Nanospheres, inorganic nanoparticles, fluorescent dyes, introduction agents, preservatives, antibacterial agents, electromagnetic radiation absorbing materials Isotope specific substances, radioisotope-containing molecules, contrast-enhanced contrast agents, cell function inhibitors, cell function enhancers, intracellular that subcellular structural inhibitors (agents that disrupt cellular substructures), intracellular substructure modifiers (agents that modify The emulsion according to claim 1, wherein at least one of cellular substructures), a cellular metabolic pathway agent, a cell apoptosis inducer, and a combination thereof is mixed or dispersed. The first liquid of the outer droplet is hydrophobic, and further includes fat, lipid, wax, natural oil, synthetic oil, silicone oil, volatile oil, essential oil, fragrance, cholesterol, steroid, hydrophobic drug Molecule, polymer, block copolymer, poly-acid, poly-base, polypeptide, block copolypeptide, micelle, quantum dot, nanoparticle, nanocluster, carbon nanotube, fullerene, magnetic fluid, thermotropic liquid crystal, lyotropic liquid crystal The emulsion according to claim 1, wherein at least one of fluorinated liquid, brominated liquid, plant-derived substance, animal-derived substance, bacteria-derived substance, and combinations thereof is mixed or dispersed. The first liquid of the outer droplet is hydrophobic, and further includes fat, lipid, wax, natural oil, synthetic oil, silicone oil, volatile oil, essential oil, fragrance, cholesterol, steroid, hydrophobic drug Molecule, polymer, block copolymer, polypeptide, block copolypeptide, poly-acid, poly-base, micelle, quantum dot, nanoparticle, nanocluster, carbon nanotube, fullerene, magnetic fluid, thermotropic liquid crystal, lyotropic liquid crystal 14. The emulsion according to claim 13, wherein at least one of fluorinated liquid, brominated liquid, plant-derived substance, animal-derived substance, bacteria-derived substance, and combinations thereof is mixed or dispersed. An outer droplet of a first liquid having an outer surface;
An inner droplet of a second liquid having an inner surface within the first droplet, the second liquid being immiscible with the first liquid, the inner droplet and the outer liquid An inner droplet having a film of the first liquid in a boundary surface region between the droplets;
An outer layer of a block copolymer disposed on the outer surface of the outer droplet;
A droplet structure comprising an inner layer of a block copolymer disposed on the inner surface of the inner droplet,
The block copolymer jointly stabilizes the outer surface of the outer droplet against coalescence with the inner surface of the inner droplet and the liquid against coalescence with other droplet structures. Including a hydrophilic polymer block and a hydrophobic polymer block that stabilize the droplet structure,
The hydrophilic polymer block is a polypeptide block mainly containing hydrophilic amino acids, and the hydrophobic polymer block is a polypeptide block mainly containing hydrophobic amino acids,
Hydrophobic amino acids wherein the hydrophobic amino acid is racemic-alanine, racemic-glycine, racemic-isoleucine, racemic-leucine, racemic-methionine, racemic-phenylalanine, racemic-proline, racemic-tryptophan, racemic-valine and combinations thereof Droplet structure selected from the group of The droplet structure according to claim 16, wherein a maximum diameter given by an undeformed droplet diameter of the droplet structure is 1000 nm or less and 10 nm or more. The droplet structure according to claim 16, wherein a maximum diameter given by an undeformed droplet diameter of the droplet structure is 250 nm or less and 50 nm or more. The droplet structure according to claim 16, wherein the block copolymer in the inner layer of the block copolymer has substantially the same molecular form as the block copolymer in the outer layer of the block copolymer. The droplet according to claim 16, wherein the hydrophilic polymer block has a molecular weight in the range of 200 Da to 3,000,000 Da, and the hydrophobic polymer block has a molecular weight in the range of 200 Da to 3,000,000 Da. Construction. The droplet structure according to claim 16, wherein a ratio obtained by dividing the radius of the inner droplet by the radius of the outer droplet is 0.9 or less and 0.05 or more. The inner layer of the block copolymer is a diblock copolymer layer formed from the polymerization of two distinct types of monomers, and the outer layer of the block copolymer is the two distinct types of the different types. The droplet structure of claim 16 which is a layer of a diblock copolymer formed from polymerization of a monomer. 17. The droplet structure of claim 16, wherein at least one of the polypeptide blocks includes a partial surface that provides surface functionalization. The droplet structure according to claim 16, wherein the hydrophilic polymer block is a polypeptide block containing a plurality of hydrophilic amino acids, and the hydrophobic polymer block is a polypeptide block containing a plurality of hydrophobic amino acids. The hydrophilic amino acid is L-arginine, L-asparagine, L-aspartic acid, L-cysteine, L-glutamic acid, L-glutamine, L-histidine, L-lysine, L-serine, L-threonine, L-tyrosine. , D-arginine, D-asparagine, D-aspartic acid, D-cysteine, D-glutamic acid, D-glutamine, D-histidine, D-lysine, D-serine, D-threonine, D-tyrosine, DL-arginine, Hydrophilic amino acid comprising DL-asparagine, DL-aspartic acid, DL-cysteine, DL-glutamic acid, DL-glutamine, DL-histidine, DL-lysine, DL-serine, DL-threonine), DL-tyrosine and combinations thereof The droplet structure of claim 16, selected from the group of: The hydrophilic amino acid and the hydrophobic amino acid are alanine, arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, 17. The droplet structure of claim 16, selected from the group of amino acids consisting of valine and combinations thereof. The droplet structure according to claim 16, wherein the hydrophilic amino acid is L-lysine and the hydrophobic amino acid is racemic-leucine. When the block copolymer is such that K represents L-lysine, rL represents racemic-leucine, x is an integer in the range of 10 to 200, and y is an integer in the range of 3 to 30, KxrLy The droplet structure according to claim 16, which is a block copolypeptide having a structure satisfying the formula. The second liquid of the inner droplet is hydrophilic and further includes single-stranded DNA, double-stranded DNA, RNA, oligonucleotide, peptide, protein, salt, virus, vitamin, serum, lysate , ATP, GTP, molecular motor, hydrophilic drug molecule, cell, vesicle, nanodroplet, nanoparticle, fullerene, single-walled carbon nanotube, multi-walled carbon nanotube, cytoplasm, ribosome, enzyme, glucose, hemoglobin, Golgi, dendrimer, Surfactant, lipid, albumin, anion, cation, buffer, saccharide, saccharide, quantum dot, clay nanoparticle, metal nanocluster, metal nanoparticle, magnetically sensitive iron oxide nanoparticle, organic nanosphere, organic nanoparticle, inorganic Nanospheres, inorganic nanoparticles, fluorescent dyes, introduction agents, preservatives, antibacterial agents, electromagnetic radiation absorbing materials Isotope specific substance, radioisotope-containing molecule, contrast enhancement contrast agent, magnetic resonance imaging contrast agent, X-ray imaging contrast agent, neutron imaging contrast agent, positron emission tomography contrast agent, light scattering enhancement agent, cell function inhibitor, cell At least one of a function enhancer, an agent that disrupt cellular substructures, an agent that modify cellular substructures, a cell metabolic pathway agent, a cell apoptosis inducer, and combinations thereof The droplet structure according to claim 16, wherein the two are mixed or dispersed. The first liquid of the outer droplet is hydrophobic, and further includes fat, lipid, wax, natural oil, synthetic oil, silicone oil, volatile oil, essential oil, fragrance, cholesterol, steroid, hydrophobic drug Molecule, polymer, block copolymer, poly-acid, poly-base, polypeptide, block polypeptide, micelle, quantum dot, nanoparticle, nanocluster, carbon nanotube, fullerene, magnetic fluid, thermotropic liquid crystal, lyotropic liquid crystal The droplet structure according to claim 16, wherein at least one of fluorinated liquid, brominated liquid, plant-derived material, animal-derived material, bacteria-derived material, and combinations thereof is mixed or dispersed. The first liquid of the outer droplet is hydrophobic, and further includes fat, lipid, wax, natural oil, synthetic oil, silicone oil, volatile oil, essential oil, fragrance, cholesterol, steroid, hydrophobic drug Molecule, polymer, block copolymer, poly-acid, poly-base, polypeptide, block polypeptide, micelle, quantum dot, nanoparticle, nanocluster, carbon nanotube, fullerene, magnetic fluid, thermotropic liquid crystal, lyotropic liquid crystal 30. The droplet structure according to claim 29, wherein at least one of fluorinated liquid, brominated liquid, plant-derived material, animal-derived material, bacteria-derived material, and combinations thereof is mixed or dispersed. An outer droplet of a first liquid having an outer surface;
An inner droplet of a second liquid disposed within the first droplet and having an inner surface, the second liquid being immiscible with the first liquid, the inner droplet and An inner droplet having the film of the first liquid in a boundary surface region between the outer droplet and the outer droplet;
An outer layer of a block copolypeptide disposed on the outer surface of the outer droplet;
A nanodroplet structure comprising an inner layer of a block copolypeptide disposed on the inner surface proximate to the boundary surface region between the inner droplet and the outer droplet,
When K is L-lysine, rL is racemic-leucine, x is an integer in the range of 10 to 200, and y is an integer in the range of 3 to 30, the block copolypeptide satisfies the formula of KxrLy A nanodroplet structure having a maximum diameter given by an undeformed droplet diameter of the nanodroplet structure of 300 nm or less and 10 nm or more. The second liquid of the inner droplet is hydrophilic and further includes single-stranded DNA, double-stranded DNA, RNA, oligonucleotide, peptide, protein, salt, virus, vitamin, serum, lysate , ATP, GTP, molecular motor, hydrophilic drug molecule, cell, vesicle, nanodroplet, nanoparticle, fullerene, single-walled carbon nanotube, multi-walled carbon nanotube, cytoplasm, ribosome, enzyme, glucose, hemoglobin, Golgi, dendrimer, Surfactant, lipid, albumin, anion, cation, buffer, saccharide, saccharide, quantum dot, clay nanoparticle, metal nanocluster, metal nanoparticle, magnetically sensitive iron oxide nanoparticle, organic nanosphere, organic nanoparticle, inorganic Nanospheres, inorganic nanoparticles, fluorescent dyes, introduction agents, preservatives, antibacterial agents, electromagnetic radiation absorbing materials Isotope specific substance, radioisotope-containing molecule, contrast enhancement contrast agent, magnetic resonance imaging contrast agent, X-ray imaging contrast agent, neutron imaging contrast agent, positron emission tomography contrast agent, light scattering enhancement agent, cell function inhibitor, cell At least one of a function enhancer, an agent that disrupt cellular substructures, an agent that modify cellular substructures, a cell metabolic pathway agent, a cell apoptosis inducer, and combinations thereof 35. The nanodroplet structure of claim 32, wherein one is mixed or dispersed. The first liquid of the outer droplet is hydrophobic, and further includes fat, lipid, wax, natural oil, synthetic oil, silicone oil, volatile oil, essential oil, fragrance, cholesterol, steroid, hydrophobic drug Molecule, polymer, block copolymer, polypeptide, block polypeptide, poly-acid, poly-base, micelle, quantum dot, nanoparticle, nanocluster, carbon nanotube, fullerene, magnetic fluid, thermotropic liquid crystal, lyotropic liquid crystal 33. The nanodroplet structure according to claim 32, wherein at least one of fluorinated liquid, brominated liquid, plant-derived material, animal-derived material, bacteria-derived material, and combinations thereof is mixed or dispersed. The first liquid of the outer droplet is hydrophobic, and further includes fat, lipid, wax, natural oil, synthetic oil, silicone oil, volatile oil, essential oil, fragrance, cholesterol, steroid, hydrophobic drug Molecule, polymer, block copolymer, polypeptide, block polypeptide, poly-acid, poly-base, micelle, quantum dot, nanoparticle, nanocluster, carbon nanotube, fullerene, magnetic fluid, thermotropic liquid crystal, lyotropic liquid crystal 34. The nanodroplet structure according to claim 33, wherein at least one of fluorinated liquid, brominated liquid, plant-derived substance, animal-derived substance, bacteria-derived substance, and combinations thereof is mixed or dispersed.